Replace 10 more gt- classes with tw- (#29945)

Likely the biggest change of the tailwind refactors. Only thing of note
is that `tw-flex-1` resolves to `flex: 1 1 0%` while our `gt-f1` was
`flex: 1 1 0`, I don't think it will make any difference. Commands I've
ran:

```sh
perl -p -i -e 's#gt-vm#tw-align-middle#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-fw#tw-flex-wrap#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-f1#tw-flex-1#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-fc#tw-flex-col#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-sb#tw-justify-between#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-je#tw-justify-end#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-jc#tw-justify-center#g' web_src/js/**/* templates/**/* models/**/*
perl -p -i -e 's#gt-ac#tw-content-center#g' web_src/js/**/* templates/**/* models/**/* tests/**/*
perl -p -i -e 's#gt-df#tw-flex#g' web_src/js/**/* templates/**/* models/**/* tests/**/*
perl -p -i -e 's#gt-dib#tw-inline-block#g' web_src/js/**/* templates/**/* models/**/* tests/**/*

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

123 files changed, 308 insertions, 322 deletions

diff --git a/docs/content/contributing/guidelines-frontend.en-us.md b/docs/content/contributing/guidelines-frontend.en-us.md
index 2c0aaaed4a..eec4a88fd0 100644
--- a/docs/content/contributing/guidelines-frontend.en-us.md
+++ b/docs/content/contributing/guidelines-frontend.en-us.md
@@ -47,7 +47,7 @@ We recommend [Google HTML/CSS Style Guide](https://google.github.io/styleguide/h
 9. Avoid unnecessary `!important` in CSS, add comments to explain why it's necessary if it can't be avoided.
 10. Avoid mixing different events in one event listener, prefer to use individual event listeners for every event.
 11. Custom event names are recommended to use `ce-` prefix.
-12. Prefer using Tailwind CSS which is available via `tw-` prefix, e.g. `tw-relative`. Gitea's helper CSS classes use `gt-` prefix (`gt-df`), while Gitea's own private framework-level CSS classes use `g-` prefix (`g-modal-confirm`).
+12. Prefer using Tailwind CSS which is available via `tw-` prefix, e.g. `tw-relative`. Gitea's helper CSS classes use `gt-` prefix (`gt-mono`), while Gitea's own private framework-level CSS classes use `g-` prefix (`g-modal-confirm`).
 13. Avoid inline scripts & styles as much as possible, it's recommended to put JS code into JS files and use CSS classes. If inline scripts & styles are unavoidable, explain the reason why it can't be avoided.
 
 ### Accessibility / ARIA
diff --git a/docs/content/contributing/guidelines-frontend.zh-cn.md b/docs/content/contributing/guidelines-frontend.zh-cn.md
index b5fb8964b3..040dba3d76 100644
--- a/docs/content/contributing/guidelines-frontend.zh-cn.md
+++ b/docs/content/contributing/guidelines-frontend.zh-cn.md
@@ -47,7 +47,7 @@ HTML 页面由[Go HTML Template](https://pkg.go.dev/html/template)渲染。
 9. 避免在 CSS 中使用不必要的`!important`，如果无法避免，添加注释解释为什么需要它。
 10. 避免在一个事件监听器中混合不同的事件，优先为每个事件使用独立的事件监听器。
 11. 推荐使用自定义事件名称前缀`ce-`。
-12. 建议使用 Tailwind CSS，它可以通过 `tw-` 前缀获得，例如 `tw-relative`. Gitea 自身的助手类 CSS 使用 `gt-` 前缀（`gt-df`），Gitea 自身的私有框架级 CSS 类使用 `g-` 前缀（`g-modal-confirm`）。
+12. 建议使用 Tailwind CSS，它可以通过 `tw-` 前缀获得，例如 `tw-relative`. Gitea 自身的助手类 CSS 使用 `gt-` 前缀（`gt-mono`），Gitea 自身的私有框架级 CSS 类使用 `g-` 前缀（`g-modal-confirm`）。
 13. 尽量避免内联脚本和样式，建议将JS代码放入JS文件中并使用CSS类。如果内联脚本和样式不可避免，请解释无法避免的原因。
 
 ### 可访问性 / ARIA
diff --git a/models/avatars/avatar.go b/models/avatars/avatar.go
index bbe16483bf..9c56e0f9a0 100644
--- a/models/avatars/avatar.go
+++ b/models/avatars/avatar.go
@@ -24,7 +24,7 @@ import (
 
 const (
 	// DefaultAvatarClass is the default class of a rendered avatar
-	DefaultAvatarClass = "ui avatar gt-vm"
+	DefaultAvatarClass = "ui avatar tw-align-middle"
 	// DefaultAvatarPixelSize is the default size in pixels of a rendered avatar
 	DefaultAvatarPixelSize = 28
 )
diff --git a/templates/admin/emails/list.tmpl b/templates/admin/emails/list.tmpl
index 660df55999..0b5249fbd9 100644
--- a/templates/admin/emails/list.tmpl
+++ b/templates/admin/emails/list.tmpl
@@ -4,8 +4,8 @@
 			{{ctx.Locale.Tr "admin.emails.email_manage_panel"}} ({{ctx.Locale.Tr "admin.total" .Total}})
 		</h4>
 		<div class="ui attached segment">
-			<div class="ui secondary filter menu gt-ac gt-mx-0">
-				<form class="ui form ignore-dirty gt-f1">
+			<div class="ui secondary filter menu tw-content-center gt-mx-0">
+				<form class="ui form ignore-dirty tw-flex-1">
 					{{template "shared/search/combo" dict "Value" .Keyword}}
 				</form>
 				<!-- Sort -->
diff --git a/templates/admin/notice.tmpl b/templates/admin/notice.tmpl
index f7d77eab1d..c788ebc602 100644
--- a/templates/admin/notice.tmpl
+++ b/templates/admin/notice.tmpl
@@ -17,7 +17,7 @@
 			<tbody>
 				{{range .Notices}}
 					<tr>
-						<td><div class="ui checkbox gt-df" data-id="{{.ID}}"><input type="checkbox"></div></td>
+						<td><div class="ui checkbox tw-flex" data-id="{{.ID}}"><input type="checkbox"></div></td>
 						<td>{{.ID}}</td>
 						<td>{{ctx.Locale.Tr .TrStr}}</td>
 						<td class="view-detail auto-ellipsis" style="width: 80%;"><span class="notice-description">{{.Description}}</span></td>
diff --git a/templates/admin/org/list.tmpl b/templates/admin/org/list.tmpl
index 4609d1b8b4..abd43d297e 100644
--- a/templates/admin/org/list.tmpl
+++ b/templates/admin/org/list.tmpl
@@ -7,8 +7,8 @@
 			</div>
 		</h4>
 		<div class="ui attached segment">
-			<div class="ui secondary filter menu gt-ac gt-mx-0">
-				<form class="ui form ignore-dirty gt-f1">
+			<div class="ui secondary filter menu tw-content-center gt-mx-0">
+				<form class="ui form ignore-dirty tw-flex-1">
 					{{template "shared/search/combo" dict "Value" .Keyword "Placeholder" (ctx.Locale.Tr "search.org_kind")}}
 				</form>
 				<!-- Sort -->
diff --git a/templates/admin/queue_manage.tmpl b/templates/admin/queue_manage.tmpl
index 80214d1021..dd1682a000 100644
--- a/templates/admin/queue_manage.tmpl
+++ b/templates/admin/queue_manage.tmpl
@@ -30,7 +30,7 @@
 								-
 							{{else}}
 								{{$sum}}
-								<form action="{{$.Link}}/remove-all-items" method="post" class="gt-dib gt-ml-4">
+								<form action="{{$.Link}}/remove-all-items" method="post" class="tw-inline-block gt-ml-4">
 									{{$.CsrfTokenHtml}}
 									<button class="ui tiny basic red button">{{ctx.Locale.Tr "admin.monitor.queue.settings.remove_all_items"}}</button>
 								</form>
diff --git a/templates/admin/repo/unadopted.tmpl b/templates/admin/repo/unadopted.tmpl
index c65cfd9db4..eb8188de14 100644
--- a/templates/admin/repo/unadopted.tmpl
+++ b/templates/admin/repo/unadopted.tmpl
@@ -20,8 +20,8 @@
 				{{if .Dirs}}
 					<div class="ui aligned divided list">
 						{{range $dirI, $dir := .Dirs}}
-							<div class="item gt-df gt-ac">
-								<span class="gt-f1"> {{svg "octicon-file-directory-fill"}} {{$dir}}</span>
+							<div class="item tw-flex tw-content-center">
+								<span class="tw-flex-1"> {{svg "octicon-file-directory-fill"}} {{$dir}}</span>
 								<div>
 									<button class="ui button primary show-modal gt-p-3" data-modal="#adopt-unadopted-modal-{{$dirI}}">{{svg "octicon-plus"}} {{ctx.Locale.Tr "repo.adopt_preexisting_label"}}</button>
 									<div class="ui g-modal-confirm modal" id="adopt-unadopted-modal-{{$dirI}}">
diff --git a/templates/admin/stacktrace-row.tmpl b/templates/admin/stacktrace-row.tmpl
index ffb8bf812f..fdce81eda7 100644
--- a/templates/admin/stacktrace-row.tmpl
+++ b/templates/admin/stacktrace-row.tmpl
@@ -1,5 +1,5 @@
 <div class="item">
-	<div class="gt-df gt-ac">
+	<div class="tw-flex tw-content-center">
 		<div class="icon gt-ml-3 gt-mr-3">
 			{{if eq .Process.Type "request"}}
 				{{svg "octicon-globe" 16}}
@@ -11,7 +11,7 @@
 				{{svg "octicon-code" 16}}
 			{{end}}
 		</div>
-		<div class="content gt-f1">
+		<div class="content tw-flex-1">
 			<div class="header">{{.Process.Description}}</div>
 			<div class="description">{{if ne .Process.Type "none"}}{{TimeSince .Process.Start ctx.Locale}}{{end}}</div>
 		</div>
@@ -40,9 +40,9 @@
 						</summary>
 						<div class="list">
 							{{range .Entry}}
-								<div class="item gt-df gt-ac">
+								<div class="item tw-flex tw-content-center">
 									<span class="icon gt-mr-4">{{svg "octicon-dot-fill" 16}}</span>
-									<div class="content gt-f1">
+									<div class="content tw-flex-1">
 										<div class="header"><code>{{.Function}}</code></div>
 										<div class="description"><code>{{.File}}:{{.Line}}</code></div>
 									</div>
diff --git a/templates/admin/stacktrace.tmpl b/templates/admin/stacktrace.tmpl
index 950aa0ea86..3c13c1e9dd 100644
--- a/templates/admin/stacktrace.tmpl
+++ b/templates/admin/stacktrace.tmpl
@@ -1,8 +1,8 @@
 {{template "admin/layout_head" (dict "ctxData" . "pageClass" "admin monitor")}}
 <div class="admin-setting-content">
 
-	<div class="gt-df gt-ac">
-		<div class="gt-f1">
+	<div class="tw-flex tw-content-center">
+		<div class="tw-flex-1">
 			<div class="ui compact small menu">
 				<a class="{{if eq .ShowGoroutineList "process"}}active {{end}}item" href="?show=process">{{ctx.Locale.Tr "admin.monitor.process"}}</a>
 				<a class="{{if eq .ShowGoroutineList "stacktrace"}}active {{end}}item" href="?show=stacktrace">{{ctx.Locale.Tr "admin.monitor.stacktrace"}}</a>
diff --git a/templates/admin/user/list.tmpl b/templates/admin/user/list.tmpl
index 091cbe7287..427eef7a78 100644
--- a/templates/admin/user/list.tmpl
+++ b/templates/admin/user/list.tmpl
@@ -103,7 +103,7 @@
 								<td><span>{{ctx.Locale.Tr "admin.users.never_login"}}</span></td>
 							{{end}}
 							<td>
-								<div class="gt-df gt-gap-3">
+								<div class="tw-flex gt-gap-3">
 									<a href="{{$.Link}}/{{.ID}}" data-tooltip-content="{{ctx.Locale.Tr "admin.users.details"}}">{{svg "octicon-person"}}</a>
 									<a href="{{$.Link}}/{{.ID}}/edit" data-tooltip-content="{{ctx.Locale.Tr "edit"}}">{{svg "octicon-pencil"}}</a>
 								</div>
diff --git a/templates/admin/user/view.tmpl b/templates/admin/user/view.tmpl
index fd3017607c..21943a8382 100644
--- a/templates/admin/user/view.tmpl
+++ b/templates/admin/user/view.tmpl
@@ -2,7 +2,7 @@
 
 <div class="admin-setting-content">
 	<div class="admin-responsive-columns">
-		<div class="gt-f1">
+		<div class="tw-flex-1">
 			<h4 class="ui top attached header">
 				{{.Title}}
 				<div class="ui right">
@@ -13,7 +13,7 @@
 				{{template "admin/user/view_details" .}}
 			</div>
 		</div>
-		<div class="gt-f1">
+		<div class="tw-flex-1">
 			<h4 class="ui top attached header">
 				{{ctx.Locale.Tr "admin.emails"}}
 				<div class="ui right">
diff --git a/templates/base/head_navbar.tmpl b/templates/base/head_navbar.tmpl
index ffa2ef844f..1c2a7b2d9a 100644
--- a/templates/base/head_navbar.tmpl
+++ b/templates/base/head_navbar.tmpl
@@ -56,7 +56,7 @@
 	<div class="navbar-right ui secondary menu">
 		{{if and .IsSigned .MustChangePassword}}
 			<div class="ui dropdown jump item" data-tooltip-content="{{ctx.Locale.Tr "user_profile_and_more"}}">
-				<span class="text gt-df gt-ac">
+				<span class="text tw-flex tw-content-center">
 					{{ctx.AvatarUtils.Avatar .SignedUser 24 "gt-mr-2"}}
 					<span class="only-mobile gt-ml-3">{{.SignedUser.Name}}</span>
 					<span class="not-mobile">{{svg "octicon-triangle-down"}}</span>
@@ -83,8 +83,8 @@
 				<span class="only-mobile gt-ml-3">{{ctx.Locale.Tr "active_stopwatch"}}</span>
 			</a>
 			<div class="active-stopwatch-popup item tippy-target gt-p-3">
-				<div class="gt-df gt-ac">
-					<a class="stopwatch-link gt-df gt-ac" href="{{.ActiveStopwatch.IssueLink}}">
+				<div class="tw-flex tw-content-center">
+					<a class="stopwatch-link tw-flex tw-content-center" href="{{.ActiveStopwatch.IssueLink}}">
 						{{svg "octicon-issue-opened" 16 "gt-mr-3"}}
 						<span class="stopwatch-issue">{{.ActiveStopwatch.RepoSlug}}#{{.ActiveStopwatch.IssueIndex}}</span>
 						<span class="ui primary label stopwatch-time gt-my-0 gt-mx-4" data-seconds="{{.ActiveStopwatch.Seconds}}">
@@ -142,7 +142,7 @@
 			</div><!-- end dropdown menu create new -->
 
 			<div class="ui dropdown jump item gt-mx-0 gt-pr-3" data-tooltip-content="{{ctx.Locale.Tr "user_profile_and_more"}}">
-				<span class="text gt-df gt-ac">
+				<span class="text tw-flex tw-content-center">
 					{{ctx.AvatarUtils.Avatar .SignedUser 24 "gt-mr-2"}}
 					<span class="only-mobile gt-ml-3">{{.SignedUser.Name}}</span>
 					<span class="not-mobile">{{svg "octicon-triangle-down"}}</span>
diff --git a/templates/devtest/fomantic-modal.tmpl b/templates/devtest/fomantic-modal.tmpl
index 0b4199a197..5cd36721a7 100644
--- a/templates/devtest/fomantic-modal.tmpl
+++ b/templates/devtest/fomantic-modal.tmpl
@@ -73,7 +73,7 @@
 		{{template "base/modal_actions_confirm" (dict "ModalButtonDangerText" "I know and must do  this is dangerous operation")}}
 	</div>
 
-	<div class="modal-buttons flex-text-block gt-fw"></div>
+	<div class="modal-buttons flex-text-block tw-flex-wrap"></div>
 	<script type="module">
 		for (const el of $('.ui.modal')) {
 			const $btn = $('<button>').text(`${el.id}`).on('click', () => {
diff --git a/templates/devtest/tmplerr.tmpl b/templates/devtest/tmplerr.tmpl
index 2fe3f1effd..09cf05fc1f 100644
--- a/templates/devtest/tmplerr.tmpl
+++ b/templates/devtest/tmplerr.tmpl
@@ -1,6 +1,6 @@
 {{template "base/head" .}}
 <div class="page-content devtest">
-	<div class="gt-df">
+	<div class="tw-flex">
 		<div style="width: 80%; ">
 			hello hello hello hello hello hello hello hello hello hello
 		</div>
diff --git a/templates/explore/search.tmpl b/templates/explore/search.tmpl
index c1d114125e..505fc64548 100644
--- a/templates/explore/search.tmpl
+++ b/templates/explore/search.tmpl
@@ -1,5 +1,5 @@
-<div class="ui small secondary filter menu gt-ac gt-mx-0">
-	<form class="ui form ignore-dirty gt-f1">
+<div class="ui small secondary filter menu tw-content-center gt-mx-0">
+	<form class="ui form ignore-dirty tw-flex-1">
 		{{if .PageIsExploreUsers}}
 			{{template "shared/search/combo" dict "Value" .Keyword "Placeholder" (ctx.Locale.Tr "search.user_kind")}}
 		{{else}}
diff --git a/templates/explore/user_list.tmpl b/templates/explore/user_list.tmpl
index fb86fbbea2..e49ca1d069 100644
--- a/templates/explore/user_list.tmpl
+++ b/templates/explore/user_list.tmpl
@@ -1,6 +1,6 @@
 <div class="flex-list">
 	{{range .Users}}
-		<div class="flex-item gt-ac">
+		<div class="flex-item tw-content-center">
 			<div class="flex-item-leading">
 				{{ctx.AvatarUtils.Avatar . 48}}
 			</div>
diff --git a/templates/org/header.tmpl b/templates/org/header.tmpl
index 1a55101c2e..c8a0ad3ab0 100644
--- a/templates/org/header.tmpl
+++ b/templates/org/header.tmpl
@@ -1,13 +1,13 @@
-<div class="ui container gt-df">
+<div class="ui container tw-flex">
 	{{ctx.AvatarUtils.Avatar .Org 100 "org-avatar"}}
-	<div id="org-info" class="gt-df gt-fc">
+	<div id="org-info" class="tw-flex tw-flex-col">
 		<div class="ui header">
 			{{.Org.DisplayName}}
 			<span class="org-visibility">
 				{{if .Org.Visibility.IsLimited}}<span class="ui large basic horizontal label">{{ctx.Locale.Tr "org.settings.visibility.limited_shortname"}}</span>{{end}}
 				{{if .Org.Visibility.IsPrivate}}<span class="ui large basic horizontal label">{{ctx.Locale.Tr "org.settings.visibility.private_shortname"}}</span>{{end}}
 			</span>
-			<span class="gt-df gt-ac gt-gap-2 tw-ml-auto gt-font-16 tw-whitespace-nowrap">
+			<span class="tw-flex tw-content-center gt-gap-2 tw-ml-auto gt-font-16 tw-whitespace-nowrap">
 				{{if .EnableFeed}}
 					<a class="ui basic label button gt-mr-0" href="{{.Org.HomeLink}}.rss" data-tooltip-content="{{ctx.Locale.Tr "rss_feed"}}">
 						{{svg "octicon-rss" 24}}
diff --git a/templates/org/home.tmpl b/templates/org/home.tmpl
index ddd05b4738..04c6a65608 100644
--- a/templates/org/home.tmpl
+++ b/templates/org/home.tmpl
@@ -25,9 +25,9 @@
 					<div class="divider"></div>
 				{{end}}
 				{{if .NumMembers}}
-					<h4 class="ui top attached header gt-df">
-						<strong class="gt-f1">{{ctx.Locale.Tr "org.members"}}</strong>
-						<a class="text grey gt-df gt-ac" href="{{.OrgLink}}/members"><span>{{.NumMembers}}</span> {{svg "octicon-chevron-right"}}</a>
+					<h4 class="ui top attached header tw-flex">
+						<strong class="tw-flex-1">{{ctx.Locale.Tr "org.members"}}</strong>
+						<a class="text grey tw-flex tw-content-center" href="{{.OrgLink}}/members"><span>{{.NumMembers}}</span> {{svg "octicon-chevron-right"}}</a>
 					</h4>
 					<div class="ui attached segment members">
 						{{$isMember := .IsOrganizationMember}}
@@ -39,9 +39,9 @@
 					</div>
 				{{end}}
 				{{if .IsOrganizationMember}}
-					<div class="ui top attached header gt-df">
-						<strong class="gt-f1">{{ctx.Locale.Tr "org.teams"}}</strong>
-						<a class="text grey gt-df gt-ac" href="{{.OrgLink}}/teams"><span>{{.Org.NumTeams}}</span> {{svg "octicon-chevron-right"}}</a>
+					<div class="ui top attached header tw-flex">
+						<strong class="tw-flex-1">{{ctx.Locale.Tr "org.teams"}}</strong>
+						<a class="text grey tw-flex tw-content-center" href="{{.OrgLink}}/teams"><span>{{.Org.NumTeams}}</span> {{svg "octicon-chevron-right"}}</a>
 					</div>
 					<div class="ui attached table segment teams">
 						{{range .Teams}}
diff --git a/templates/org/member/members.tmpl b/templates/org/member/members.tmpl
index 54f84450eb..cb9e60da29 100644
--- a/templates/org/member/members.tmpl
+++ b/templates/org/member/members.tmpl
@@ -7,7 +7,7 @@
 		<div class="flex-list">
 			{{range .Members}}
 				{{$isPublic := index $.MembersIsPublicMember .ID}}
-				<div class="flex-item {{if $.PublicOnly}}gt-ac{{end}}">
+				<div class="flex-item {{if $.PublicOnly}}tw-content-center{{end}}">
 					<div class="flex-item-leading">
 						<a href="{{.HomeLink}}">{{ctx.AvatarUtils.Avatar . 48}}</a>
 					</div>
diff --git a/templates/org/settings/labels.tmpl b/templates/org/settings/labels.tmpl
index 8eb7b4584e..19a7d5355e 100644
--- a/templates/org/settings/labels.tmpl
+++ b/templates/org/settings/labels.tmpl
@@ -1,7 +1,7 @@
 {{template "org/settings/layout_head" (dict "ctxData" . "pageClass" "organization settings labels")}}
 				<div class="org-setting-content">
-					<div class="gt-df gt-ac">
-						<div class="gt-f1">
+					<div class="tw-flex tw-content-center">
+						<div class="tw-flex-1">
 							{{ctx.Locale.Tr "org.settings.labels_desc"}}
 						</div>
 						<button class="ui small primary new-label button">{{ctx.Locale.Tr "repo.issues.new_label"}}</button>
diff --git a/templates/org/team/members.tmpl b/templates/org/team/members.tmpl
index 02220a917a..d86aeb7ce4 100644
--- a/templates/org/team/members.tmpl
+++ b/templates/org/team/members.tmpl
@@ -9,7 +9,7 @@
 				{{template "org/team/navbar" .}}
 				{{if .IsOrganizationOwner}}
 					<div class="ui attached segment">
-						<form class="ui form ignore-dirty gt-df gt-fw gt-gap-3" action="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/add" method="post">
+						<form class="ui form ignore-dirty tw-flex tw-flex-wrap gt-gap-3" action="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/add" method="post">
 							{{.CsrfTokenHtml}}
 							<input type="hidden" name="uid" value="{{.SignedUser.ID}}">
 							<div id="search-user-box" class="ui search gt-mr-3"{{if .IsEmailInviteEnabled}} data-allow-email="true" data-allow-email-description="{{ctx.Locale.Tr "org.teams.invite_team_member" $.Team.Name}}"{{end}}>
@@ -24,7 +24,7 @@
 				<div class="ui attached segment">
 					<div class="flex-list">
 						{{range .Team.Members}}
-							<div class="flex-item gt-ac">
+							<div class="flex-item tw-content-center">
 								<div class="flex-item-leading">
 									<a href="{{.HomeLink}}">{{ctx.AvatarUtils.Avatar . 32}}</a>
 								</div>
@@ -56,7 +56,7 @@
 				<div class="ui attached segment">
 					<div class="flex-list">
 						{{range .Invites}}
-							<div class="flex-item gt-ac">
+							<div class="flex-item tw-content-center">
 								<div class="flex-item-main">
 									{{.Email}}
 								</div>
diff --git a/templates/org/team/new.tmpl b/templates/org/team/new.tmpl
index 50ef53b91b..d1e0dbe382 100644
--- a/templates/org/team/new.tmpl
+++ b/templates/org/team/new.tmpl
@@ -78,11 +78,11 @@
 										<tr>
 											<th>{{ctx.Locale.Tr "units.unit"}}</th>
 											<th class="center aligned">{{ctx.Locale.Tr "org.teams.none_access"}}
-											<span class="gt-vm" data-tooltip-content="{{ctx.Locale.Tr "org.teams.none_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
+											<span class="tw-align-middle" data-tooltip-content="{{ctx.Locale.Tr "org.teams.none_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
 											<th class="center aligned">{{ctx.Locale.Tr "org.teams.read_access"}}
-											<span class="gt-vm" data-tooltip-content="{{ctx.Locale.Tr "org.teams.read_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
+											<span class="tw-align-middle" data-tooltip-content="{{ctx.Locale.Tr "org.teams.read_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
 											<th class="center aligned">{{ctx.Locale.Tr "org.teams.write_access"}}
-											<span class="gt-vm" data-tooltip-content="{{ctx.Locale.Tr "org.teams.write_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
+											<span class="tw-align-middle" data-tooltip-content="{{ctx.Locale.Tr "org.teams.write_access_helper"}}">{{svg "octicon-question" 16 "gt-ml-2"}}</span></th>
 										</tr>
 									</thead>
 									<tbody>
diff --git a/templates/org/team/repositories.tmpl b/templates/org/team/repositories.tmpl
index bd38cda6d1..9efe8f9f09 100644
--- a/templates/org/team/repositories.tmpl
+++ b/templates/org/team/repositories.tmpl
@@ -9,8 +9,8 @@
 				{{template "org/team/navbar" .}}
 				{{$canAddRemove := and $.IsOrganizationOwner (not $.Team.IncludesAllRepositories)}}
 				{{if $canAddRemove}}
-					<div class="ui attached segment gt-df gt-fw gt-gap-3">
-						<form class="ui form ignore-dirty gt-f1 gt-df" action="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/repo/add" method="post">
+					<div class="ui attached segment tw-flex tw-flex-wrap gt-gap-3">
+						<form class="ui form ignore-dirty tw-flex-1 tw-flex" action="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/repo/add" method="post">
 							{{.CsrfTokenHtml}}
 							<div id="search-repo-box" data-uid="{{.Org.ID}}" class="ui search">
 								<div class="ui input">
@@ -19,7 +19,7 @@
 							</div>
 							<button class="ui primary button gt-ml-3">{{ctx.Locale.Tr "add"}}</button>
 						</form>
-						<div class="gt-dib">
+						<div class="tw-inline-block">
 							<button class="ui primary button link-action" data-modal-confirm="{{ctx.Locale.Tr "org.teams.add_all_repos_desc"}}" data-url="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/repo/addall">{{ctx.Locale.Tr "add_all"}}</button>
 							<button class="ui red button link-action" data-modal-confirm="{{ctx.Locale.Tr "org.teams.remove_all_repos_desc"}}" data-url="{{$.OrgLink}}/teams/{{$.Team.LowerName | PathEscape}}/action/repo/removeall">{{ctx.Locale.Tr "remove_all"}}</button>
 						</div>
@@ -28,7 +28,7 @@
 				<div class="ui attached segment">
 					<div class="flex-list">
 						{{range .Team.Repos}}
-							<div class="flex-item gt-ac">
+							<div class="flex-item tw-content-center">
 								<div class="flex-item-leading">
 									{{template "repo/icon" .}}
 								</div>
diff --git a/templates/package/view.tmpl b/templates/package/view.tmpl
index 54af71126f..e81a714895 100644
--- a/templates/package/view.tmpl
+++ b/templates/package/view.tmpl
@@ -90,8 +90,8 @@
 				<a class="tw-float-right" href="{{$.PackageDescriptor.PackageWebLink}}/versions">{{ctx.Locale.Tr "packages.versions.view_all"}}</a>
 				<div class="ui relaxed list">
 				{{range .LatestVersions}}
-					<div class="item gt-df">
-						<a class="gt-f1 gt-ellipsis" title="{{.Version}}" href="{{$.PackageDescriptor.PackageWebLink}}/{{PathEscape .LowerVersion}}">{{.Version}}</a>
+					<div class="item tw-flex">
+						<a class="tw-flex-1 gt-ellipsis" title="{{.Version}}" href="{{$.PackageDescriptor.PackageWebLink}}/{{PathEscape .LowerVersion}}">{{.Version}}</a>
 						<span class="text small">{{DateTime "short" .CreatedUnix}}</span>
 					</div>
 				{{end}}
diff --git a/templates/projects/list.tmpl b/templates/projects/list.tmpl
index d87e7e0663..f33f9180bb 100644
--- a/templates/projects/list.tmpl
+++ b/templates/projects/list.tmpl
@@ -1,5 +1,5 @@
 {{if and $.CanWriteProjects (not $.Repository.IsArchived)}}
-	<div class="gt-df gt-sb gt-mb-4">
+	<div class="tw-flex tw-justify-between gt-mb-4">
 		<div class="small-menu-items ui compact tiny menu list-header-toggle">
 			<a class="item{{if not .IsShowClosed}} active{{end}}" href="?state=open&q={{$.Keyword}}">
 				{{svg "octicon-project-symlink" 16 "gt-mr-3"}}
diff --git a/templates/projects/view.tmpl b/templates/projects/view.tmpl
index a6e84024bc..d36ecdfc85 100644
--- a/templates/projects/view.tmpl
+++ b/templates/projects/view.tmpl
@@ -1,7 +1,7 @@
 {{$canWriteProject := and .CanWriteProjects (or (not .Repository) (not .Repository.IsArchived))}}
 
 <div class="ui container">
-	<div class="gt-df gt-sb gt-ac gt-mb-4">
+	<div class="tw-flex tw-justify-between tw-content-center gt-mb-4">
 		<h2 class="gt-mb-0">{{.Project.Title}}</h2>
 		{{if $canWriteProject}}
 			<div class="ui compact mini menu">
diff --git a/templates/repo/actions/list.tmpl b/templates/repo/actions/list.tmpl
index 55c0494566..f4215829ba 100644
--- a/templates/repo/actions/list.tmpl
+++ b/templates/repo/actions/list.tmpl
@@ -25,7 +25,7 @@
 				</div>
 			</div>
 			<div class="twelve wide column content">
-				<div class="ui secondary filter menu gt-je gt-df gt-ac">
+				<div class="ui secondary filter menu tw-justify-end tw-flex tw-content-center">
 					<!-- Actor -->
 					<div class="ui{{if not .Actors}} disabled{{end}} dropdown jump item">
 						<span class="text">{{ctx.Locale.Tr "actions.runs.actor"}}</span>
diff --git a/templates/repo/actions/runs_list.tmpl b/templates/repo/actions/runs_list.tmpl
index 580fb08a9e..b898837a26 100644
--- a/templates/repo/actions/runs_list.tmpl
+++ b/templates/repo/actions/runs_list.tmpl
@@ -6,7 +6,7 @@
 	</div>
 	{{end}}
 	{{range .Runs}}
-		<div class="flex-item gt-ac">
+		<div class="flex-item tw-content-center">
 			<div class="flex-item-leading">
 				{{template "repo/actions/status" (dict "status" .Status.String)}}
 			</div>
diff --git a/templates/repo/actions/status.tmpl b/templates/repo/actions/status.tmpl
index 5016570142..e42eafe8f6 100644
--- a/templates/repo/actions/status.tmpl
+++ b/templates/repo/actions/status.tmpl
@@ -12,7 +12,7 @@
 {{- $className = .className -}}
 {{- end -}}
 
-<span class="gt-df gt-ac" data-tooltip-content="{{ctx.Locale.Tr (printf "actions.status.%s" .status)}}">
+<span class="tw-flex tw-content-center" data-tooltip-content="{{ctx.Locale.Tr (printf "actions.status.%s" .status)}}">
 {{if eq .status "success"}}
 	{{svg "octicon-check-circle-fill" $size (printf "text green %s" $className)}}
 {{else if eq .status "skipped"}}
diff --git a/templates/repo/blame.tmpl b/templates/repo/blame.tmpl
index 4df7b18c44..5bc9a1375e 100644
--- a/templates/repo/blame.tmpl
+++ b/templates/repo/blame.tmpl
@@ -11,11 +11,11 @@
 	{{end}}
 {{end}}
 <div class="{{TabSizeClass .Editorconfig .FileName}} non-diff-file-content">
-	<h4 class="file-header ui top attached header gt-df gt-ac gt-sb gt-fw">
-		<div class="file-header-left gt-df gt-ac gt-py-3 gt-pr-4">
+	<h4 class="file-header ui top attached header tw-flex tw-content-center tw-justify-between tw-flex-wrap">
+		<div class="file-header-left tw-flex tw-content-center gt-py-3 gt-pr-4">
 			{{template "repo/file_info" .}}
 		</div>
-		<div class="file-header-right file-actions gt-df gt-ac gt-fw">
+		<div class="file-header-right file-actions tw-flex tw-content-center tw-flex-wrap">
 			<div class="ui buttons">
 				<a class="ui tiny button" href="{{$.RawFileLink}}">{{ctx.Locale.Tr "repo.file_raw"}}</a>
 				{{if not .IsViewCommit}}
diff --git a/templates/repo/branch/list.tmpl b/templates/repo/branch/list.tmpl
index 48c14cf343..21121c4f09 100644
--- a/templates/repo/branch/list.tmpl
+++ b/templates/repo/branch/list.tmpl
@@ -25,7 +25,7 @@
 									<button class="btn interact-fg gt-px-2" data-clipboard-text="{{.DefaultBranchBranch.DBBranch.Name}}">{{svg "octicon-copy" 14}}</button>
 									{{template "repo/commit_statuses" dict "Status" (index $.CommitStatus .DefaultBranchBranch.DBBranch.CommitID) "Statuses" (index $.CommitStatuses .DefaultBranchBranch.DBBranch.CommitID)}}
 								</div>
-								<p class="info gt-df gt-ac gt-my-2">{{svg "octicon-git-commit" 16 "gt-mr-2"}}<a href="{{.RepoLink}}/commit/{{PathEscape .DefaultBranchBranch.DBBranch.CommitID}}">{{ShortSha .DefaultBranchBranch.DBBranch.CommitID}}</a> · <span class="commit-message">{{RenderCommitMessage $.Context .DefaultBranchBranch.DBBranch.CommitMessage (.Repository.ComposeMetas ctx)}}</span> · {{ctx.Locale.Tr "org.repo_updated"}} {{TimeSince .DefaultBranchBranch.DBBranch.CommitTime.AsTime ctx.Locale}}{{if .DefaultBranchBranch.DBBranch.Pusher}} &nbsp;{{template "shared/user/avatarlink" dict "user" .DefaultBranchBranch.DBBranch.Pusher}}{{template "shared/user/namelink" .DefaultBranchBranch.DBBranch.Pusher}}{{end}}</p>
+								<p class="info tw-flex tw-content-center gt-my-2">{{svg "octicon-git-commit" 16 "gt-mr-2"}}<a href="{{.RepoLink}}/commit/{{PathEscape .DefaultBranchBranch.DBBranch.CommitID}}">{{ShortSha .DefaultBranchBranch.DBBranch.CommitID}}</a> · <span class="commit-message">{{RenderCommitMessage $.Context .DefaultBranchBranch.DBBranch.CommitMessage (.Repository.ComposeMetas ctx)}}</span> · {{ctx.Locale.Tr "org.repo_updated"}} {{TimeSince .DefaultBranchBranch.DBBranch.CommitTime.AsTime ctx.Locale}}{{if .DefaultBranchBranch.DBBranch.Pusher}} &nbsp;{{template "shared/user/avatarlink" dict "user" .DefaultBranchBranch.DBBranch.Pusher}}{{template "shared/user/namelink" .DefaultBranchBranch.DBBranch.Pusher}}{{end}}</p>
 							</td>
 							<td class="right aligned middle aligned overflow-visible">
 								{{if and $.IsWriter (not $.Repository.IsArchived) (not .IsDeleted)}}
@@ -67,8 +67,8 @@
 			</div>
 		{{end}}
 
-		<h4 class="ui top attached header gt-df gt-ac gt-sb">
-			<div class="gt-df gt-ac">
+		<h4 class="ui top attached header tw-flex tw-content-center tw-justify-between">
+			<div class="tw-flex tw-content-center">
 				{{ctx.Locale.Tr "repo.branches"}}
 			</div>
 		</h4>
@@ -98,7 +98,7 @@
 									<button class="btn interact-fg gt-px-2" data-clipboard-text="{{.DBBranch.Name}}">{{svg "octicon-copy" 14}}</button>
 									{{template "repo/commit_statuses" dict "Status" (index $.CommitStatus .DBBranch.CommitID) "Statuses" (index $.CommitStatuses .DBBranch.CommitID)}}
 								</div>
-								<p class="info gt-df gt-ac gt-my-2">{{svg "octicon-git-commit" 16 "gt-mr-2"}}<a href="{{$.RepoLink}}/commit/{{PathEscape .DBBranch.CommitID}}">{{ShortSha .DBBranch.CommitID}}</a> · <span class="commit-message">{{RenderCommitMessage $.Context .DBBranch.CommitMessage ($.Repository.ComposeMetas ctx)}}</span> · {{ctx.Locale.Tr "org.repo_updated"}} {{TimeSince .DBBranch.CommitTime.AsTime ctx.Locale}}{{if .DBBranch.Pusher}} &nbsp;{{template "shared/user/avatarlink" dict "user" .DBBranch.Pusher}} &nbsp;{{template "shared/user/namelink" .DBBranch.Pusher}}{{end}}</p>
+								<p class="info tw-flex tw-content-center gt-my-2">{{svg "octicon-git-commit" 16 "gt-mr-2"}}<a href="{{$.RepoLink}}/commit/{{PathEscape .DBBranch.CommitID}}">{{ShortSha .DBBranch.CommitID}}</a> · <span class="commit-message">{{RenderCommitMessage $.Context .DBBranch.CommitMessage ($.Repository.ComposeMetas ctx)}}</span> · {{ctx.Locale.Tr "org.repo_updated"}} {{TimeSince .DBBranch.CommitTime.AsTime ctx.Locale}}{{if .DBBranch.Pusher}} &nbsp;{{template "shared/user/avatarlink" dict "user" .DBBranch.Pusher}} &nbsp;{{template "shared/user/namelink" .DBBranch.Pusher}}{{end}}</p>
 							{{end}}
 							</td>
 							<td class="two wide ui">
@@ -134,7 +134,7 @@
 									</a>
 									{{end}}
 								{{else}}
-									<a href="{{.LatestPullRequest.Issue.Link}}" class="gt-vm ref-issue">{{if not .LatestPullRequest.IsSameRepo}}{{.LatestPullRequest.BaseRepo.FullName}}{{end}}#{{.LatestPullRequest.Issue.Index}}</a>
+									<a href="{{.LatestPullRequest.Issue.Link}}" class="tw-align-middle ref-issue">{{if not .LatestPullRequest.IsSameRepo}}{{.LatestPullRequest.BaseRepo.FullName}}{{end}}#{{.LatestPullRequest.Issue.Index}}</a>
 									{{if .LatestPullRequest.HasMerged}}
 										<a href="{{.LatestPullRequest.Issue.Link}}" class="ui purple large label">{{svg "octicon-git-merge" 16 "gt-mr-2"}}{{ctx.Locale.Tr "repo.pulls.merged"}}</a>
 									{{else if .LatestPullRequest.Issue.IsClosed}}
diff --git a/templates/repo/branch_dropdown.tmpl b/templates/repo/branch_dropdown.tmpl
index 367c6aab98..328429dd9e 100644
--- a/templates/repo/branch_dropdown.tmpl
+++ b/templates/repo/branch_dropdown.tmpl
@@ -70,8 +70,8 @@
 <div class="js-branch-tag-selector {{if .ContainerClasses}}{{.ContainerClasses}}{{end}}">
 	{{/* show dummy elements before Vue componment is mounted, this code must match the code in BranchTagSelector.vue */}}
 	<div class="ui dropdown custom">
-		<button class="branch-dropdown-button gt-ellipsis ui basic small compact button gt-df gt-m-0">
-			<span class="text gt-df gt-ac gt-mr-2">
+		<button class="branch-dropdown-button gt-ellipsis ui basic small compact button tw-flex gt-m-0">
+			<span class="text tw-flex tw-content-center gt-mr-2">
 				{{if .release}}
 					{{ctx.Locale.Tr "repo.release.compare"}}
 				{{else}}
diff --git a/templates/repo/code/recently_pushed_new_branches.tmpl b/templates/repo/code/recently_pushed_new_branches.tmpl
index 5e603eae81..4d11d3f603 100644
--- a/templates/repo/code/recently_pushed_new_branches.tmpl
+++ b/templates/repo/code/recently_pushed_new_branches.tmpl
@@ -1,6 +1,6 @@
 {{range .RecentlyPushedNewBranches}}
-	<div class="ui positive message gt-df gt-ac">
-		<div class="gt-f1">
+	<div class="ui positive message tw-flex tw-content-center">
+		<div class="tw-flex-1">
 			{{$timeSince := TimeSince .CommitTime.AsTime ctx.Locale}}
 			{{$branchLink := HTMLFormat `<a href="%s/src/branch/%s">%s</a>` $.RepoLink (PathEscapeSegments .Name) .Name}}
 			{{ctx.Locale.Tr "repo.pulls.recently_pushed_new_branches" $branchLink $timeSince}}
diff --git a/templates/repo/commit_load_branches_and_tags.tmpl b/templates/repo/commit_load_branches_and_tags.tmpl
index 883230ac29..49f7323845 100644
--- a/templates/repo/commit_load_branches_and_tags.tmpl
+++ b/templates/repo/commit_load_branches_and_tags.tmpl
@@ -7,13 +7,13 @@
 	<div class="branch-and-tag-detail gt-hidden">
 		<div class="divider"></div>
 		<div>{{ctx.Locale.Tr "repo.commit.contained_in"}}</div>
-		<div class="gt-df gt-mt-3">
+		<div class="tw-flex gt-mt-3">
 			<div class="gt-p-2">{{svg "octicon-git-branch"}}</div>
-			<div class="branch-area flex-text-block gt-fw gt-f1"></div>
+			<div class="branch-area flex-text-block tw-flex-wrap tw-flex-1"></div>
 		</div>
-		<div class="gt-df gt-mt-3">
+		<div class="tw-flex gt-mt-3">
 			<div class="gt-p-2">{{svg "octicon-tag"}}</div>
-			<div class="tag-area flex-text-block gt-fw gt-f1"></div>
+			<div class="tag-area flex-text-block tw-flex-wrap tw-flex-1"></div>
 		</div>
 	</div>
 </div>
diff --git a/templates/repo/commit_page.tmpl b/templates/repo/commit_page.tmpl
index 80af73ce48..1670781e24 100644
--- a/templates/repo/commit_page.tmpl
+++ b/templates/repo/commit_page.tmpl
@@ -18,8 +18,8 @@
 			{{end}}
 		{{end}}
 		<div class="ui top attached header clearing segment tw-relative commit-header {{$class}}">
-			<div class="gt-df gt-mb-4 gt-fw">
-				<h3 class="gt-mb-0 gt-f1"><span class="commit-summary" title="{{.Commit.Summary}}">{{RenderCommitMessage $.Context .Commit.Message ($.Repository.ComposeMetas ctx)}}</span>{{template "repo/commit_statuses" dict "Status" .CommitStatus "Statuses" .CommitStatuses}}</h3>
+			<div class="tw-flex gt-mb-4 tw-flex-wrap">
+				<h3 class="gt-mb-0 tw-flex-1"><span class="commit-summary" title="{{.Commit.Summary}}">{{RenderCommitMessage $.Context .Commit.Message ($.Repository.ComposeMetas ctx)}}</span>{{template "repo/commit_statuses" dict "Status" .CommitStatus "Statuses" .CommitStatuses}}</h3>
 				{{if not $.PageIsWiki}}
 					<div>
 						<a class="ui primary tiny button" href="{{.SourcePath}}">
@@ -139,8 +139,8 @@
 			{{end}}
 			{{template "repo/commit_load_branches_and_tags" .}}
 		</div>
-		<div class="ui attached segment gt-df gt-ac gt-sb gt-py-2 commit-header-row gt-fw {{$class}}">
-				<div class="gt-df gt-ac author">
+		<div class="ui attached segment tw-flex tw-content-center tw-justify-between gt-py-2 commit-header-row tw-flex-wrap {{$class}}">
+				<div class="tw-flex tw-content-center author">
 					{{if .Author}}
 						{{ctx.AvatarUtils.Avatar .Author 28 "gt-mr-3"}}
 						{{if .Author.FullName}}
@@ -164,7 +164,7 @@
 						{{end}}
 					{{end}}
 				</div>
-				<div class="ui horizontal list gt-df gt-ac">
+				<div class="ui horizontal list tw-flex tw-content-center">
 					{{if .Parents}}
 						<div class="item">
 							<span>{{ctx.Locale.Tr "repo.diff.parent"}}</span>
@@ -184,8 +184,8 @@
 				</div>
 		</div>
 		{{if .Commit.Signature}}
-			<div class="ui bottom attached message tw-text-left gt-df gt-ac gt-sb commit-header-row gt-fw gt-mb-0 {{$class}}">
-				<div class="gt-df gt-ac">
+			<div class="ui bottom attached message tw-text-left tw-flex tw-content-center tw-justify-between commit-header-row tw-flex-wrap gt-mb-0 {{$class}}">
+				<div class="tw-flex tw-content-center">
 					{{if .Verification.Verified}}
 						{{if ne .Verification.SigningUser.ID 0}}
 							{{svg "gitea-lock" 16 "gt-mr-3"}}
@@ -209,7 +209,7 @@
 						<span class="ui text">{{ctx.Locale.Tr .Verification.Reason}}</span>
 					{{end}}
 				</div>
-				<div class="gt-df gt-ac">
+				<div class="tw-flex tw-content-center">
 					{{if .Verification.Verified}}
 						{{if ne .Verification.SigningUser.ID 0}}
 							{{svg "octicon-verified" 16 "gt-mr-3"}}
diff --git a/templates/repo/commit_statuses.tmpl b/templates/repo/commit_statuses.tmpl
index b035e74c2f..f451ac06a1 100644
--- a/templates/repo/commit_statuses.tmpl
+++ b/templates/repo/commit_statuses.tmpl
@@ -1,10 +1,10 @@
 {{if .Statuses}}
 	{{if and (eq (len .Statuses) 1) .Status.TargetURL}}
-		<a class="gt-vm {{.AdditionalClasses}} tw-no-underline" data-tippy="commit-statuses" href="{{.Status.TargetURL}}">
+		<a class="tw-align-middle {{.AdditionalClasses}} tw-no-underline" data-tippy="commit-statuses" href="{{.Status.TargetURL}}">
 			{{template "repo/commit_status" .Status}}
 		</a>
 	{{else}}
-		<span class="gt-vm {{.AdditionalClasses}}" data-tippy="commit-statuses" tabindex="0">
+		<span class="tw-align-middle {{.AdditionalClasses}}" data-tippy="commit-statuses" tabindex="0">
 			{{template "repo/commit_status" .Status}}
 		</span>
 	{{end}}
diff --git a/templates/repo/commits.tmpl b/templates/repo/commits.tmpl
index 42004c2610..210f73d456 100644
--- a/templates/repo/commits.tmpl
+++ b/templates/repo/commits.tmpl
@@ -4,7 +4,7 @@
 	<div class="ui container">
 		{{template "repo/sub_menu" .}}
 		<div class="repo-button-row">
-			<div class="gt-df gt-ac">
+			<div class="tw-flex tw-content-center">
 				{{template "repo/branch_dropdown" dict "root" . "ContainerClasses" "gt-mr-2"}}
 				<a href="{{.RepoLink}}/graph" class="ui basic small compact button">
 					{{svg "octicon-git-branch"}}
diff --git a/templates/repo/commits_list_small.tmpl b/templates/repo/commits_list_small.tmpl
index 86e6b7225e..53834f7acb 100644
--- a/templates/repo/commits_list_small.tmpl
+++ b/templates/repo/commits_list_small.tmpl
@@ -13,7 +13,7 @@
 
 		{{$commitLink:= printf "%s/commit/%s" $.comment.Issue.PullRequest.BaseRepo.Link (PathEscape .ID.String)}}
 
-		<span class="shabox gt-df gt-ac tw-float-right">
+		<span class="shabox tw-flex tw-content-center tw-float-right">
 			{{template "repo/commit_statuses" dict "Status" .Status "Statuses" .Statuses}}
 			{{$class := "ui sha label"}}
 			{{if .Signature}}
diff --git a/templates/repo/commits_table.tmpl b/templates/repo/commits_table.tmpl
index 221ee8d99b..330130ac0d 100644
--- a/templates/repo/commits_table.tmpl
+++ b/templates/repo/commits_table.tmpl
@@ -1,5 +1,5 @@
-<h4 class="ui top attached header commits-table gt-df gt-ac gt-sb">
-	<div class="commits-table-left gt-df gt-ac">
+<h4 class="ui top attached header commits-table tw-flex tw-content-center tw-justify-between">
+	<div class="commits-table-left tw-flex tw-content-center">
 		{{if or .PageIsCommits (gt .CommitCount 0)}}
 			{{.CommitCount}} {{ctx.Locale.Tr "repo.commits.commits"}}
 		{{else if .IsNothingToCompare}}
diff --git a/templates/repo/diff/blob_excerpt.tmpl b/templates/repo/diff/blob_excerpt.tmpl
index 353f6db705..201bff805a 100644
--- a/templates/repo/diff/blob_excerpt.tmpl
+++ b/templates/repo/diff/blob_excerpt.tmpl
@@ -3,7 +3,7 @@
 	<tr class="{{.GetHTMLDiffLineType}}-code nl-{{$k}} ol-{{$k}}">
 		{{if eq .GetType 4}}
 			<td class="lines-num lines-num-old" data-line-num="{{if $line.LeftIdx}}{{$line.LeftIdx}}{{end}}">
-				<div class="gt-df">
+				<div class="tw-flex">
 				{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
 					<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 						{{svg "octicon-fold-down"}}
@@ -49,7 +49,7 @@
 	<tr class="{{.GetHTMLDiffLineType}}-code nl-{{$k}} ol-{{$k}}">
 		{{if eq .GetType 4}}
 			<td colspan="2" class="lines-num">
-				<div class="gt-df">
+				<div class="tw-flex">
 					{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
 						<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.RepoLink}}/blob_excerpt/{{PathEscape $.AfterCommitID}}?data-query={{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.PageIsWiki}}&anchor={{$.Anchor}}">
 							{{svg "octicon-fold-down"}}
diff --git a/templates/repo/diff/box.tmpl b/templates/repo/diff/box.tmpl
index d2ee5db1b8..d71ad1b2ad 100644
--- a/templates/repo/diff/box.tmpl
+++ b/templates/repo/diff/box.tmpl
@@ -1,7 +1,7 @@
 {{$showFileTree := (and (not .DiffNotAvailable) (gt .Diff.NumFiles 1))}}
 <div>
 	<div class="diff-detail-box diff-box">
-		<div class="gt-df gt-ac gt-fw gt-gap-3 gt-ml-1">
+		<div class="tw-flex tw-content-center tw-flex-wrap gt-gap-3 gt-ml-1">
 			{{if $showFileTree}}
 				<button class="diff-toggle-file-tree-button not-mobile btn interact-fg" data-show-text="{{ctx.Locale.Tr "repo.diff.show_file_tree"}}" data-hide-text="{{ctx.Locale.Tr "repo.diff.hide_file_tree"}}">
 					{{/* the icon meaning is reversed here, "octicon-sidebar-collapse" means show the file tree */}}
@@ -18,14 +18,14 @@
 				</script>
 			{{end}}
 			{{if not .DiffNotAvailable}}
-				<div class="diff-detail-stats gt-df gt-ac gt-fw">
+				<div class="diff-detail-stats tw-flex tw-content-center tw-flex-wrap">
 					{{svg "octicon-diff" 16 "gt-mr-2"}}{{ctx.Locale.Tr "repo.diff.stats_desc" .Diff.NumFiles .Diff.TotalAddition .Diff.TotalDeletion}}
 				</div>
 			{{end}}
 		</div>
 		<div class="diff-detail-actions">
 			{{if and .PageIsPullFiles $.SignedUserID (not .IsArchived) (not .DiffNotAvailable)}}
-				<div class="not-mobile gt-df gt-ac gt-fc tw-whitespace-nowrap gt-mr-2">
+				<div class="not-mobile tw-flex tw-content-center tw-flex-col tw-whitespace-nowrap gt-mr-2">
 					<label for="viewed-files-summary" id="viewed-files-summary-label" data-text-changed-template="{{ctx.Locale.Tr "repo.pulls.viewed_files_label"}}">
 						{{ctx.Locale.Tr "repo.pulls.viewed_files_label" .Diff.NumViewedFiles .Diff.NumFiles}}
 					</label>
@@ -110,8 +110,8 @@
 					{{$isExpandable := or (gt $file.Addition 0) (gt $file.Deletion 0) $file.IsBin}}
 					{{$isReviewFile := and $.IsSigned $.PageIsPullFiles (not $.IsArchived) $.IsShowingAllCommits}}
 					<div class="diff-file-box diff-box file-content {{TabSizeClass $.Editorconfig $file.Name}} gt-mt-0" id="diff-{{$file.NameHash}}" data-old-filename="{{$file.OldName}}" data-new-filename="{{$file.Name}}" {{if or ($file.ShouldBeHidden) (not $isExpandable)}}data-folded="true"{{end}}>
-						<h4 class="diff-file-header sticky-2nd-row ui top attached normal header gt-df gt-ac gt-sb gt-fw">
-							<div class="diff-file-name gt-df gt-ac gt-gap-2 gt-fw">
+						<h4 class="diff-file-header sticky-2nd-row ui top attached normal header tw-flex tw-content-center tw-justify-between tw-flex-wrap">
+							<div class="diff-file-name tw-flex tw-content-center gt-gap-2 tw-flex-wrap">
 								<button class="fold-file btn interact-bg gt-p-2{{if not $isExpandable}} tw-invisible{{end}}">
 									{{if $file.ShouldBeHidden}}
 										{{svg "octicon-chevron-right" 18}}
@@ -119,7 +119,7 @@
 										{{svg "octicon-chevron-down" 18}}
 									{{end}}
 								</button>
-								<div class="gt-font-semibold gt-df gt-ac gt-mono">
+								<div class="gt-font-semibold tw-flex tw-content-center gt-mono">
 									{{if $file.IsBin}}
 										<span class="gt-ml-1 gt-mr-3">
 											{{ctx.Locale.Tr "repo.diff.bin"}}
@@ -144,7 +144,7 @@
 									<span class="gt-ml-4 gt-mono">{{ctx.Locale.Tr ($file.ModeTranslationKey $file.Mode)}}</span>
 								{{end}}
 							</div>
-							<div class="diff-file-header-actions gt-df gt-ac gt-gap-2 gt-fw">
+							<div class="diff-file-header-actions tw-flex tw-content-center gt-gap-2 tw-flex-wrap">
 								{{if $showFileViewToggle}}
 									<div class="ui compact icon buttons">
 										<button class="ui tiny basic button file-view-toggle" data-toggle-selector="#diff-source-{{$file.NameHash}}" data-tooltip-content="{{ctx.Locale.Tr "repo.file_view_source"}}">{{svg "octicon-code"}}</button>
@@ -218,7 +218,7 @@
 
 				{{if .Diff.IsIncomplete}}
 					<div class="diff-file-box diff-box file-content gt-mt-3" id="diff-incomplete">
-						<h4 class="ui top attached normal header gt-df gt-ac gt-sb">
+						<h4 class="ui top attached normal header tw-flex tw-content-center tw-justify-between">
 							{{ctx.Locale.Tr "repo.diff.too_many_files"}}
 							<a class="ui basic tiny button" id="diff-show-more-files" data-href="?skip-to={{.Diff.End}}&file-only=true">{{ctx.Locale.Tr "repo.diff.show_more"}}</a>
 						</h4>
diff --git a/templates/repo/diff/comments.tmpl b/templates/repo/diff/comments.tmpl
index 227dcc49d0..aed01ef5fb 100644
--- a/templates/repo/diff/comments.tmpl
+++ b/templates/repo/diff/comments.tmpl
@@ -8,8 +8,8 @@
 		{{template "shared/user/avatarlink" dict "user" .Poster}}
 	{{end}}
 	<div class="content comment-container">
-		<div class="ui top attached header comment-header gt-df gt-ac gt-sb">
-			<div class="comment-header-left gt-df gt-ac">
+		<div class="ui top attached header comment-header tw-flex tw-content-center tw-justify-between">
+			<div class="comment-header-left tw-flex tw-content-center">
 				{{if .OriginalAuthor}}
 					<span class="text black gt-font-semibold gt-mr-2">
 						{{svg (MigrationIcon $.root.Repository.GetOriginalURLHostname)}}
@@ -30,7 +30,7 @@
 					</span>
 				{{end}}
 			</div>
-			<div class="comment-header-right actions gt-df gt-ac">
+			<div class="comment-header-right actions tw-flex tw-content-center">
 				{{if .Invalidated}}
 					{{$referenceUrl := printf "%s#%s" $.root.Issue.Link .HashTag}}
 					<a href="{{$referenceUrl}}" class="ui label basic small" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.review.outdated_description"}}">
diff --git a/templates/repo/diff/conversation.tmpl b/templates/repo/diff/conversation.tmpl
index 507f17fd94..1bc018e8e2 100644
--- a/templates/repo/diff/conversation.tmpl
+++ b/templates/repo/diff/conversation.tmpl
@@ -8,8 +8,8 @@
 	{{$referenceUrl := printf "%s#%s" $.Issue.Link $comment.HashTag}}
 	<div class="conversation-holder" data-path="{{$comment.TreePath}}" data-side="{{if lt $comment.Line 0}}left{{else}}right{{end}}" data-idx="{{$comment.UnsignedLine}}">
 		{{if $resolved}}
-			<div class="ui attached header resolved-placeholder gt-df gt-ac gt-sb">
-				<div class="ui grey text gt-df gt-ac gt-fw gt-gap-2">
+			<div class="ui attached header resolved-placeholder tw-flex tw-content-center tw-justify-between">
+				<div class="ui grey text tw-flex tw-content-center tw-flex-wrap gt-gap-2">
 					{{svg "octicon-check" 16 "icon gt-mr-2"}}
 					<b>{{$resolveDoer.Name}}</b> {{ctx.Locale.Tr "repo.issues.review.resolved_by"}}
 					{{if $invalid}}
@@ -22,12 +22,12 @@
 						</a>
 					{{end}}
 				</div>
-				<div class="gt-df gt-ac gt-gap-3">
-					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button show-outdated gt-df gt-ac">
+				<div class="tw-flex tw-content-center gt-gap-3">
+					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button show-outdated tw-flex tw-content-center">
 						{{svg "octicon-unfold" 16 "gt-mr-3"}}
 						{{ctx.Locale.Tr "repo.issues.review.show_resolved"}}
 					</button>
-					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button hide-outdated gt-df gt-ac gt-hidden">
+					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="ui tiny labeled button hide-outdated tw-flex tw-content-center gt-hidden">
 						{{svg "octicon-fold" 16 "gt-mr-3"}}
 						{{ctx.Locale.Tr "repo.issues.review.hide_resolved"}}
 					</button>
@@ -40,7 +40,7 @@
 					{{template "repo/diff/comments" dict "root" $ "comments" .comments}}
 				</ui>
 			</div>
-			<div class="gt-df gt-je gt-ac gt-fw gt-mt-3">
+			<div class="tw-flex tw-justify-end tw-content-center tw-flex-wrap gt-mt-3">
 				<div class="ui buttons gt-mr-2">
 					<button class="ui icon tiny basic button previous-conversation">
 						{{svg "octicon-arrow-up" 12 "icon"}} {{ctx.Locale.Tr "repo.issues.previous"}}
diff --git a/templates/repo/diff/new_review.tmpl b/templates/repo/diff/new_review.tmpl
index ae7182c930..9d1eef712d 100644
--- a/templates/repo/diff/new_review.tmpl
+++ b/templates/repo/diff/new_review.tmpl
@@ -1,5 +1,5 @@
 <div id="review-box">
-	<button class="ui tiny primary button gt-pr-2 gt-df js-btn-review {{if not $.IsShowingAllCommits}}disabled{{end}}" {{if not $.IsShowingAllCommits}}data-tooltip-content="{{ctx.Locale.Tr "repo.pulls.review_only_possible_for_full_diff"}}"{{end}}>
+	<button class="ui tiny primary button gt-pr-2 tw-flex js-btn-review {{if not $.IsShowingAllCommits}}disabled{{end}}" {{if not $.IsShowingAllCommits}}data-tooltip-content="{{ctx.Locale.Tr "repo.pulls.review_only_possible_for_full_diff"}}"{{end}}>
 		{{ctx.Locale.Tr "repo.diff.review"}}
 		<span class="ui small label review-comments-counter" data-pending-comment-number="{{.PendingCodeCommentNumber}}">{{.PendingCodeCommentNumber}}</span>
 		{{svg "octicon-triangle-down" 14 "dropdown icon"}}
@@ -10,8 +10,8 @@
 			<form class="ui form form-fetch-action" action="{{.Link}}/reviews/submit" method="post">
 				{{.CsrfTokenHtml}}
 				<input type="hidden" name="commit_id" value="{{.AfterCommitID}}">
-				<div class="field gt-df gt-ac">
-					<div class="gt-f1">{{ctx.Locale.Tr "repo.diff.review.header"}}</div>
+				<div class="field tw-flex tw-content-center">
+					<div class="tw-flex-1">{{ctx.Locale.Tr "repo.diff.review.header"}}</div>
 					<a class="muted close">{{svg "octicon-x" 16}}</a>
 				</div>
 				<div class="field">
@@ -31,7 +31,7 @@
 				<div class="divider"></div>
 				{{$showSelfTooltip := (and $.IsSigned ($.Issue.IsPoster $.SignedUser.ID))}}
 				{{if $showSelfTooltip}}
-					<span class="gt-dib" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.review.self_approve"}}">
+					<span class="tw-inline-block" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.review.self_approve"}}">
 						<button type="submit" name="type" value="approve" disabled class="ui submit primary tiny button btn-submit">{{ctx.Locale.Tr "repo.diff.review.approve"}}</button>
 					</span>
 				{{else}}
@@ -39,7 +39,7 @@
 				{{end}}
 				<button type="submit" name="type" value="comment" class="ui submit tiny basic button btn-submit">{{ctx.Locale.Tr "repo.diff.review.comment"}}</button>
 				{{if $showSelfTooltip}}
-					<span class="gt-dib" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.review.self_reject"}}">
+					<span class="tw-inline-block" data-tooltip-content="{{ctx.Locale.Tr "repo.diff.review.self_reject"}}">
 						<button type="submit" name="type" value="reject" disabled class="ui submit red tiny button btn-submit">{{ctx.Locale.Tr "repo.diff.review.reject"}}</button>
 					</span>
 				{{else}}
diff --git a/templates/repo/diff/section_split.tmpl b/templates/repo/diff/section_split.tmpl
index 0999d36f20..5af5da09b4 100644
--- a/templates/repo/diff/section_split.tmpl
+++ b/templates/repo/diff/section_split.tmpl
@@ -16,7 +16,7 @@
 			<tr class="{{.GetHTMLDiffLineType}}-code nl-{{$k}} ol-{{$k}}" data-line-type="{{.GetHTMLDiffLineType}}">
 				{{if eq .GetType 4}}
 					<td class="lines-num lines-num-old">
-						<div class="gt-df">
+						<div class="tw-flex">
 						{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
 							<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=split&direction=down&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 								{{svg "octicon-fold-down"}}
diff --git a/templates/repo/diff/section_unified.tmpl b/templates/repo/diff/section_unified.tmpl
index 2fc116a991..eb51c46d88 100644
--- a/templates/repo/diff/section_unified.tmpl
+++ b/templates/repo/diff/section_unified.tmpl
@@ -12,7 +12,7 @@
 			{{if eq .GetType 4}}
 				{{if $.root.AfterCommitID}}
 					<td colspan="2" class="lines-num">
-						<div class="gt-df">
+						<div class="tw-flex">
 							{{if or (eq $line.GetExpandDirection 3) (eq $line.GetExpandDirection 5)}}
 								<button class="code-expander-button" hx-target="closest tr" hx-get="{{$.root.RepoLink}}/blob_excerpt/{{PathEscape $.root.AfterCommitID}}?{{$line.GetBlobExcerptQuery}}&style=unified&direction=down&wiki={{$.root.PageIsWiki}}&anchor=diff-{{$file.NameHash}}K{{$line.SectionInfo.RightIdx}}">
 									{{svg "octicon-fold-down"}}
diff --git a/templates/repo/find/files.tmpl b/templates/repo/find/files.tmpl
index eac6ec2011..de2c34a158 100644
--- a/templates/repo/find/files.tmpl
+++ b/templates/repo/find/files.tmpl
@@ -2,10 +2,10 @@
 <div role="main" aria-label="{{.Title}}" class="page-content repository">
 	{{template "repo/header" .}}
 	<div class="ui container">
-		<div class="gt-df gt-ac">
+		<div class="tw-flex tw-content-center">
 			<a href="{{$.RepoLink}}">{{.RepoName}}</a>
 			<span class="gt-mx-3">/</span>
-			<div class="ui input gt-f1">
+			<div class="ui input tw-flex-1">
 				<input id="repo-file-find-input" type="text" autofocus data-url-data-link="{{.DataLink}}" data-url-tree-link="{{.TreeLink}}">
 			</div>
 		</div>
diff --git a/templates/repo/forks.tmpl b/templates/repo/forks.tmpl
index b27b55c131..0a4b369cdb 100644
--- a/templates/repo/forks.tmpl
+++ b/templates/repo/forks.tmpl
@@ -6,7 +6,7 @@
 			{{ctx.Locale.Tr "repo.forks"}}
 		</h2>
 		{{range .Forks}}
-			<div class="gt-df gt-ac gt-py-3">
+			<div class="tw-flex tw-content-center gt-py-3">
 				<span class="gt-mr-2">{{ctx.AvatarUtils.Avatar .Owner}}</span>
 				<a href="{{.Owner.HomeLink}}">{{.Owner.Name}}</a> / <a href="{{.Link}}">{{.Name}}</a>
 			</div>
diff --git a/templates/repo/graph/commits.tmpl b/templates/repo/graph/commits.tmpl
index 61ef1fe10d..fc7cf925ab 100644
--- a/templates/repo/graph/commits.tmpl
+++ b/templates/repo/graph/commits.tmpl
@@ -28,10 +28,10 @@
 							{{- end -}}
 						</a>
 					</span>
-					<span class="message gt-dib gt-ellipsis gt-mr-3">
+					<span class="message tw-inline-block gt-ellipsis gt-mr-3">
 						<span>{{RenderCommitMessage $.Context $commit.Subject ($.Repository.ComposeMetas ctx)}}</span>
 					</span>
-					<span class="commit-refs gt-df gt-ac gt-mr-2">
+					<span class="commit-refs tw-flex tw-content-center gt-mr-2">
 						{{range $commit.Refs}}
 							{{$refGroup := .RefGroup}}
 							{{if eq $refGroup "pull"}}
@@ -58,7 +58,7 @@
 							{{end}}
 						{{end}}
 					</span>
-					<span class="author gt-df gt-ac gt-mr-3">
+					<span class="author tw-flex tw-content-center gt-mr-3">
 						{{$userName := $commit.Commit.Author.Name}}
 						{{if $commit.User}}
 							{{if $commit.User.FullName}}
@@ -71,7 +71,7 @@
 							{{$userName}}
 						{{end}}
 					</span>
-					<span class="time gt-df gt-ac">{{DateTime "full" $commit.Date}}</span>
+					<span class="time tw-flex tw-content-center">{{DateTime "full" $commit.Date}}</span>
 				{{end}}
 			</li>
 		{{end}}
diff --git a/templates/repo/header.tmpl b/templates/repo/header.tmpl
index e4d39839fc..b7ee38ae83 100644
--- a/templates/repo/header.tmpl
+++ b/templates/repo/header.tmpl
@@ -2,7 +2,7 @@
 {{with .Repository}}
 	<div class="ui container">
 		<div class="repo-header">
-			<div class="flex-item gt-ac">
+			<div class="flex-item tw-content-center">
 				<div class="flex-item-leading">
 					{{template "repo/icon" .}}
 				</div>
diff --git a/templates/repo/home.tmpl b/templates/repo/home.tmpl
index 24bafb8d9d..7dfc6cfd73 100644
--- a/templates/repo/home.tmpl
+++ b/templates/repo/home.tmpl
@@ -27,19 +27,19 @@
 				</div>
 			{{end}}
 		</div>
-		<div class="gt-df gt-ac gt-fw gt-gap-2" id="repo-topics">
+		<div class="tw-flex tw-content-center tw-flex-wrap gt-gap-2" id="repo-topics">
 			{{range .Topics}}<a class="ui repo-topic large label topic gt-m-0" href="{{AppSubUrl}}/explore/repos?q={{.Name}}&topic=1">{{.Name}}</a>{{end}}
 			{{if and .Permission.IsAdmin (not .Repository.IsArchived)}}<button id="manage_topic" class="btn interact-fg gt-font-12">{{ctx.Locale.Tr "repo.topic.manage_topics"}}</button>{{end}}
 		</div>
 		{{end}}
 		{{if and .Permission.IsAdmin (not .Repository.IsArchived)}}
-		<div class="ui form gt-hidden gt-df gt-fc gt-mt-4" id="topic_edit">
-			<div class="field gt-f1 gt-mb-2">
-				<div class="ui fluid multiple search selection dropdown gt-fw" data-text-count-prompt="{{ctx.Locale.Tr "repo.topic.count_prompt"}}" data-text-format-prompt="{{ctx.Locale.Tr "repo.topic.format_prompt"}}">
+		<div class="ui form gt-hidden tw-flex tw-flex-col gt-mt-4" id="topic_edit">
+			<div class="field tw-flex-1 gt-mb-2">
+				<div class="ui fluid multiple search selection dropdown tw-flex-wrap" data-text-count-prompt="{{ctx.Locale.Tr "repo.topic.count_prompt"}}" data-text-format-prompt="{{ctx.Locale.Tr "repo.topic.format_prompt"}}">
 					<input type="hidden" name="topics" value="{{range $i, $v := .Topics}}{{.Name}}{{if Eval $i "+" 1 "<" (len $.Topics)}},{{end}}{{end}}">
 					{{range .Topics}}
 						{{/* keey the same layout as Fomantic UI generated labels */}}
-						<a class="ui label transition visible tw-cursor-default gt-dib" data-value="{{.Name}}">{{.Name}}{{svg "octicon-x" 16 "delete icon"}}</a>
+						<a class="ui label transition visible tw-cursor-default tw-inline-block" data-value="{{.Name}}">{{.Name}}{{svg "octicon-x" 16 "delete icon"}}</a>
 					{{end}}
 					<div class="text"></div>
 				</div>
@@ -61,7 +61,7 @@
 		{{end}}
 		{{template "repo/sub_menu" .}}
 		<div class="repo-button-row">
-			<div class="gt-df gt-ac gt-fw gt-gap-y-3">
+			<div class="tw-flex tw-content-center tw-flex-wrap gt-gap-y-3">
 				{{template "repo/branch_dropdown" dict "root" . "ContainerClasses" "gt-mr-2"}}
 				{{if and .CanCompareOrPull .IsViewBranch (not .Repository.IsArchived)}}
 					{{$cmpBranch := ""}}
@@ -121,7 +121,7 @@
 					</span>
 				{{end}}
 			</div>
-			<div class="gt-df gt-ac">
+			<div class="tw-flex tw-content-center">
 				<!-- Only show clone panel in repository home page -->
 				{{if eq $n 0}}
 					<div class="clone-panel ui action tiny input">
diff --git a/templates/repo/icon.tmpl b/templates/repo/icon.tmpl
index a001f81891..e5e0bd68e7 100644
--- a/templates/repo/icon.tmpl
+++ b/templates/repo/icon.tmpl
@@ -1,6 +1,6 @@
 {{$avatarLink := (.RelAvatarLink ctx)}}
 {{if $avatarLink}}
-	<img class="ui avatar gt-vm" src="{{$avatarLink}}" width="24" height="24" alt="{{.FullName}}">
+	<img class="ui avatar tw-align-middle" src="{{$avatarLink}}" width="24" height="24" alt="{{.FullName}}">
 {{else if $.IsMirror}}
 	{{svg "octicon-mirror" 24}}
 {{else if $.IsFork}}
diff --git a/templates/repo/issue/card.tmpl b/templates/repo/issue/card.tmpl
index b461c5fc98..47c44af9b8 100644
--- a/templates/repo/issue/card.tmpl
+++ b/templates/repo/issue/card.tmpl
@@ -7,13 +7,13 @@
 		</div>
 	{{end}}
 	<div class="content gt-p-0 tw-w-full">
-		<div class="gt-df tw-items-start">
+		<div class="tw-flex tw-items-start">
 			<div class="issue-card-icon">
 				{{template "shared/issueicon" .}}
 			</div>
 			<a class="issue-card-title muted issue-title" href="{{.Link}}">{{.Title | RenderEmoji ctx | RenderCodeBlock}}</a>
 			{{if and $.isPinnedIssueCard $.Page.IsRepoAdmin}}
-				<a role="button" class="issue-card-unpin muted gt-df gt-ac" data-tooltip-content={{ctx.Locale.Tr "repo.issues.unpin_issue"}} data-issue-id="{{.ID}}" data-unpin-url="{{$.Page.Link}}/unpin/{{.Index}}">
+				<a role="button" class="issue-card-unpin muted tw-flex tw-content-center" data-tooltip-content={{ctx.Locale.Tr "repo.issues.unpin_issue"}} data-issue-id="{{.ID}}" data-unpin-url="{{$.Page.Link}}/unpin/{{.Index}}">
 					{{svg "octicon-x" 16}}
 				</a>
 			{{end}}
@@ -34,8 +34,8 @@
 		{{if .MilestoneID}}
 		<div class="meta gt-my-2">
 			<a class="milestone" href="{{.Repo.Link}}/milestone/{{.MilestoneID}}">
-				{{svg "octicon-milestone" 16 "gt-mr-2 gt-vm"}}
-				<span class="gt-vm">{{.Milestone.Name}}</span>
+				{{svg "octicon-milestone" 16 "gt-mr-2 tw-align-middle"}}
+				<span class="tw-align-middle">{{.Milestone.Name}}</span>
 			</a>
 		</div>
 		{{end}}
@@ -43,8 +43,8 @@
 		{{range index $.Page.LinkedPRs .ID}}
 		<div class="meta gt-my-2">
 			<a href="{{$.Issue.Repo.Link}}/pulls/{{.Index}}">
-				<span class="gt-m-0 text {{if .PullRequest.HasMerged}}purple{{else if .IsClosed}}red{{else}}green{{end}}">{{svg "octicon-git-merge" 16 "gt-mr-2 gt-vm"}}</span>
-				<span class="gt-vm">{{.Title}} <span class="text light grey">#{{.Index}}</span></span>
+				<span class="gt-m-0 text {{if .PullRequest.HasMerged}}purple{{else if .IsClosed}}red{{else}}green{{end}}">{{svg "octicon-git-merge" 16 "gt-mr-2 tw-align-middle"}}</span>
+				<span class="tw-align-middle">{{.Title}} <span class="text light grey">#{{.Index}}</span></span>
 			</a>
 		</div>
 		{{end}}
@@ -52,8 +52,8 @@
 		{{$tasks := .GetTasks}}
 		{{if gt $tasks 0}}
 			<div class="meta gt-my-2">
-				{{svg "octicon-checklist" 16 "gt-mr-2 gt-vm"}}
-				<span class="gt-vm">{{.GetTasksDone}} / {{$tasks}}</span>
+				{{svg "octicon-checklist" 16 "gt-mr-2 tw-align-middle"}}
+				<span class="tw-align-middle">{{.GetTasksDone}} / {{$tasks}}</span>
 			</div>
 		{{end}}
 	</div>
diff --git a/templates/repo/issue/filter_actions.tmpl b/templates/repo/issue/filter_actions.tmpl
index f573b8e09e..9c259fe0e1 100644
--- a/templates/repo/issue/filter_actions.tmpl
+++ b/templates/repo/issue/filter_actions.tmpl
@@ -29,7 +29,7 @@
 						<div class="divider"></div>
 					{{end}}
 					{{$previousExclusiveScope = $exclusiveScope}}
-					<div class="item issue-action gt-df gt-sb" data-action="toggle" data-element-id="{{.ID}}" data-url="{{$.RepoLink}}/issues/labels">
+					<div class="item issue-action tw-flex tw-justify-between" data-action="toggle" data-element-id="{{.ID}}" data-url="{{$.RepoLink}}/issues/labels">
 						{{if SliceUtils.Contains $.SelLabelIDs .ID}}{{if $exclusiveScope}}{{svg "octicon-dot-fill"}}{{else}}{{svg "octicon-check"}}{{end}}{{end}} {{RenderLabel $.Context ctx.Locale .}}
 						{{template "repo/issue/labels/label_archived" .}}
 					</div>
diff --git a/templates/repo/issue/filter_list.tmpl b/templates/repo/issue/filter_list.tmpl
index 696b7db46b..b5c950b121 100644
--- a/templates/repo/issue/filter_list.tmpl
+++ b/templates/repo/issue/filter_list.tmpl
@@ -32,7 +32,7 @@
 				<div class="divider"></div>
 			{{end}}
 			{{$previousExclusiveScope = $exclusiveScope}}
-			<a class="item label-filter-item gt-df gt-ac" {{if .IsArchived}}data-is-archived{{end}} href="?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.QueryString}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{$.AssigneeID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}" data-label-id="{{.ID}}">
+			<a class="item label-filter-item tw-flex tw-content-center" {{if .IsArchived}}data-is-archived{{end}} href="?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.QueryString}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{$.AssigneeID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}" data-label-id="{{.ID}}">
 				{{if .IsExcluded}}
 					{{svg "octicon-circle-slash"}}
 				{{else if .IsSelected}}
@@ -107,7 +107,7 @@
 				{{ctx.Locale.Tr "repo.issues.new.open_projects"}}
 			</div>
 			{{range .OpenProjects}}
-				<a class="{{if $.ProjectID}}{{if eq $.ProjectID .ID}}active selected{{end}}{{end}} item gt-df" href="?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{.ID}}&assignee={{$.AssigneeID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">
+				<a class="{{if $.ProjectID}}{{if eq $.ProjectID .ID}}active selected{{end}}{{end}} item tw-flex" href="?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{.ID}}&assignee={{$.AssigneeID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">
 					{{svg .IconName 18 "gt-mr-3 tw-shrink-0"}}<span class="gt-ellipsis">{{.Title}}</span>
 				</a>
 			{{end}}
@@ -160,7 +160,7 @@
 		<a class="{{if eq .AssigneeID -1}}active selected {{end}}item" href="?q={{$.Keyword}}&type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee=-1&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">{{ctx.Locale.Tr "repo.issues.filter_assginee_no_assignee"}}</a>
 		<div class="divider"></div>
 		{{range .Assignees}}
-			<a class="{{if eq $.AssigneeID .ID}}active selected{{end}} item gt-df" href="?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{.ID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">
+			<a class="{{if eq $.AssigneeID .ID}}active selected{{end}} item tw-flex" href="?type={{$.ViewType}}&sort={{$.SortType}}&state={{$.State}}&labels={{$.SelectLabels}}&milestone={{$.MilestoneID}}&project={{$.ProjectID}}&assignee={{.ID}}&poster={{$.PosterID}}{{if $.ShowArchivedLabels}}&archived=true{{end}}">
 				{{ctx.AvatarUtils.Avatar . 20}}{{template "repo/search_name" .}}
 			</a>
 		{{end}}
diff --git a/templates/repo/issue/label_precolors.tmpl b/templates/repo/issue/label_precolors.tmpl
index 146119b978..80007662c0 100644
--- a/templates/repo/issue/label_precolors.tmpl
+++ b/templates/repo/issue/label_precolors.tmpl
@@ -1,5 +1,5 @@
 <div class="precolors">
-	<div class="gt-df">
+	<div class="tw-flex">
 		<a class="color" style="background-color:#e11d21" data-color-hex="#e11d21"></a>
 		<a class="color" style="background-color:#eb6420" data-color-hex="#eb6420"></a>
 		<a class="color" style="background-color:#fbca04" data-color-hex="#fbca04"></a>
@@ -9,7 +9,7 @@
 		<a class="color" style="background-color:#0052cc" data-color-hex="#0052cc"></a>
 		<a class="color" style="background-color:#5319e7" data-color-hex="#5319e7"></a>
 	</div>
-	<div class="gt-df">
+	<div class="tw-flex">
 		<a class="color" style="background-color:#f6c6c7" data-color-hex="#f6c6c7"></a>
 		<a class="color" style="background-color:#fad8c7" data-color-hex="#fad8c7"></a>
 		<a class="color" style="background-color:#fef2c0" data-color-hex="#fef2c0"></a>
diff --git a/templates/repo/issue/labels/label_list.tmpl b/templates/repo/issue/labels/label_list.tmpl
index ca28e3af2d..86d08e5f75 100644
--- a/templates/repo/issue/labels/label_list.tmpl
+++ b/templates/repo/issue/labels/label_list.tmpl
@@ -42,9 +42,9 @@
 					<a class="open-issues" href="{{$.RepoLink}}/issues?labels={{.ID}}">{{svg "octicon-issue-opened"}} {{ctx.Locale.Tr "repo.issues.label_open_issues" .NumOpenIssues}}</a>
 				{{end}}
 			</div>
-			<div class="label-operation gt-df">
+			<div class="label-operation tw-flex">
 				{{template "repo/issue/labels/label_archived" .}}
-				<div class="gt-df tw-ml-auto">
+				<div class="tw-flex tw-ml-auto">
 					{{if and (not $.PageIsOrgSettingsLabels) (not $.Repository.IsArchived) (or $.CanWriteIssues $.CanWritePulls)}}
 						<a class="edit-label-button" href="#" data-id="{{.ID}}" data-title="{{.Name}}" {{if .Exclusive}}data-exclusive{{end}} {{if gt .ArchivedUnix 0}}data-is-archived{{end}} data-num-issues="{{.NumIssues}}" data-description="{{.Description}}" data-color={{.Color}}>{{svg "octicon-pencil"}} {{ctx.Locale.Tr "repo.issues.label_edit"}}</a>
 						<a class="delete-button" href="#" data-url="{{$.Link}}/delete" data-id="{{.ID}}">{{svg "octicon-trash"}} {{ctx.Locale.Tr "repo.issues.label_delete"}}</a>
diff --git a/templates/repo/issue/milestone_issues.tmpl b/templates/repo/issue/milestone_issues.tmpl
index 507c3ce37a..e029bf6031 100644
--- a/templates/repo/issue/milestone_issues.tmpl
+++ b/templates/repo/issue/milestone_issues.tmpl
@@ -3,10 +3,10 @@
 	{{template "repo/header" .}}
 	<div class="ui container">
 		{{template "base/alert" .}}
-		<div class="gt-df">
+		<div class="tw-flex">
 			<h1 class="gt-mb-3">{{.Milestone.Name}}</h1>
 			{{if not .Repository.IsArchived}}
-				<div class="text right gt-f1">
+				<div class="text right tw-flex-1">
 					{{if or .CanWriteIssues .CanWritePulls}}
 						{{if .Milestone.IsClosed}}
 							<a class="ui primary basic button link-action" href data-url="{{$.RepoLink}}/milestones/{{.MilestoneID}}/open">{{ctx.Locale.Tr "repo.milestones.open"}}
@@ -26,10 +26,10 @@
 				{{.Milestone.RenderedContent}}
 		</div>
 		{{end}}
-		<div class="gt-df gt-fc gt-gap-3">
+		<div class="tw-flex tw-flex-col gt-gap-3">
 			<progress class="milestone-progress-big" value="{{.Milestone.Completeness}}" max="100"></progress>
-			<div class="gt-df gt-gap-4">
-				<div classs="gt-df gt-ac">
+			<div class="tw-flex gt-gap-4">
+				<div classs="tw-flex tw-content-center">
 					{{$closedDate:= TimeSinceUnix .Milestone.ClosedDateUnix ctx.Locale}}
 					{{if .IsClosed}}
 						{{svg "octicon-clock"}} {{ctx.Locale.Tr "repo.milestones.closed" $closedDate}}
diff --git a/templates/repo/issue/milestones.tmpl b/templates/repo/issue/milestones.tmpl
index 363ba7e3a2..af7dd70193 100644
--- a/templates/repo/issue/milestones.tmpl
+++ b/templates/repo/issue/milestones.tmpl
@@ -23,7 +23,7 @@
 							{{svg "octicon-milestone" 16}}
 							<a class="muted" href="{{$.RepoLink}}/milestone/{{.ID}}">{{.Name}}</a>
 						</h3>
-						<div class="gt-df gt-ac">
+						<div class="tw-flex tw-content-center">
 							<span class="gt-mr-3">{{.Completeness}}%</span>
 							<progress value="{{.Completeness}}" max="100"></progress>
 						</div>
diff --git a/templates/repo/issue/new_form.tmpl b/templates/repo/issue/new_form.tmpl
index b2b9e308f5..ba1e19bf07 100644
--- a/templates/repo/issue/new_form.tmpl
+++ b/templates/repo/issue/new_form.tmpl
@@ -171,7 +171,7 @@
 				<div class="selected">
 				{{range .Assignees}}
 					<a class="item gt-p-2 muted gt-hidden" id="assignee_{{.ID}}" href="{{$.RepoLink}}/issues?assignee={{.ID}}">
-						{{ctx.AvatarUtils.Avatar . 28 "gt-mr-3 gt-vm"}}{{.GetDisplayName}}
+						{{ctx.AvatarUtils.Avatar . 28 "gt-mr-3 tw-align-middle"}}{{.GetDisplayName}}
 					</a>
 				{{end}}
 				</div>
diff --git a/templates/repo/issue/view_content.tmpl b/templates/repo/issue/view_content.tmpl
index 89520ebe65..ff06d8c5bd 100644
--- a/templates/repo/issue/view_content.tmpl
+++ b/templates/repo/issue/view_content.tmpl
@@ -20,8 +20,8 @@
 				</a>
 				{{end}}
 				<div class="content comment-container">
-					<div class="ui top attached header comment-header gt-df gt-ac gt-sb" role="heading" aria-level="3">
-						<div class="comment-header-left gt-df gt-ac">
+					<div class="ui top attached header comment-header tw-flex tw-content-center tw-justify-between" role="heading" aria-level="3">
+						<div class="comment-header-left tw-flex tw-content-center">
 							{{if .Issue.OriginalAuthor}}
 								<span class="text black gt-font-semibold">
 									{{svg (MigrationIcon .Repository.GetOriginalURLHostname)}}
@@ -43,7 +43,7 @@
 								</span>
 							{{end}}
 						</div>
-						<div class="comment-header-right actions gt-df gt-ac">
+						<div class="comment-header-right actions tw-flex tw-content-center">
 							{{template "repo/issue/view_content/show_role" dict "ShowRole" .Issue.ShowRole "IgnorePoster" true}}
 							{{if not $.Repository.IsArchived}}
 								{{template "repo/issue/view_content/add_reaction" dict "ctxData" $ "ActionURL" (printf "%s/issues/%d/reactions" $.RepoLink .Issue.Index)}}
diff --git a/templates/repo/issue/view_content/attachments.tmpl b/templates/repo/issue/view_content/attachments.tmpl
index 2c3a47d670..151131366f 100644
--- a/templates/repo/issue/view_content/attachments.tmpl
+++ b/templates/repo/issue/view_content/attachments.tmpl
@@ -4,8 +4,8 @@
 	{{end}}
 	{{$hasThumbnails := false}}
 	{{- range .Attachments -}}
-		<div class="gt-df">
-			<div class="gt-f1 gt-p-3">
+		<div class="tw-flex">
+			<div class="tw-flex-1 gt-p-3">
 				<a target="_blank" rel="noopener noreferrer" href="{{.DownloadURL}}" title="{{ctx.Locale.Tr "repo.issues.attachment.open_tab" .Name}}">
 					{{if FilenameIsImage .Name}}
 						{{if not (StringUtils.Contains (StringUtils.ToString $.RenderedContent) .UUID)}}
@@ -18,7 +18,7 @@
 					<span><strong>{{.Name}}</strong></span>
 				</a>
 			</div>
-			<div class="gt-p-3 gt-df gt-ac">
+			<div class="gt-p-3 tw-flex tw-content-center">
 				<span class="ui text grey">{{.Size | FileSize}}</span>
 			</div>
 		</div>
diff --git a/templates/repo/issue/view_content/comments.tmpl b/templates/repo/issue/view_content/comments.tmpl
index 6654224320..2e2ce0fc28 100644
--- a/templates/repo/issue/view_content/comments.tmpl
+++ b/templates/repo/issue/view_content/comments.tmpl
@@ -25,8 +25,8 @@
 				</a>
 			{{end}}
 				<div class="content comment-container">
-					<div class="ui top attached header comment-header gt-df gt-ac gt-sb" role="heading" aria-level="3">
-						<div class="comment-header-left gt-df gt-ac">
+					<div class="ui top attached header comment-header tw-flex tw-content-center tw-justify-between" role="heading" aria-level="3">
+						<div class="comment-header-left tw-flex tw-content-center">
 							{{if .OriginalAuthor}}
 								<span class="text black gt-font-semibold gt-mr-2">
 									{{svg (MigrationIcon $.Repository.GetOriginalURLHostname)}}
@@ -50,7 +50,7 @@
 								</span>
 							{{end}}
 						</div>
-						<div class="comment-header-right actions gt-df gt-ac">
+						<div class="comment-header-right actions tw-flex tw-content-center">
 							{{template "repo/issue/view_content/show_role" dict "ShowRole" .ShowRole}}
 							{{if not $.Repository.IsArchived}}
 								{{template "repo/issue/view_content/add_reaction" dict "ctxData" $ "ActionURL" (printf "%s/comments/%d/reactions" $.RepoLink .ID)}}
@@ -402,8 +402,8 @@
 				{{if or .Content .Attachments}}
 				<div class="timeline-item comment">
 					<div class="content comment-container">
-						<div class="ui top attached header comment-header gt-df gt-ac gt-sb">
-							<div class="comment-header-left gt-df gt-ac">
+						<div class="ui top attached header comment-header tw-flex tw-content-center tw-justify-between">
+							<div class="comment-header-left tw-flex tw-content-center">
 								{{if gt .Poster.ID 0}}
 									<a class="inline-timeline-avatar" href="{{.Poster.HomeLink}}">
 										{{ctx.AvatarUtils.Avatar .Poster 24}}
@@ -424,7 +424,7 @@
 									{{ctx.Locale.Tr "repo.issues.review.left_comment"}}
 								</span>
 							</div>
-							<div class="comment-header-right actions gt-df gt-ac">
+							<div class="comment-header-right actions tw-flex tw-content-center">
 								{{template "repo/issue/view_content/show_role" dict "ShowRole" .ShowRole}}
 								{{if not $.Repository.IsArchived}}
 									{{template "repo/issue/view_content/add_reaction" dict "ctxData" $ "ActionURL" (printf "%s/comments/%d/reactions" $.RepoLink .ID)}}
@@ -623,7 +623,7 @@
 				{{if .Content}}
 					<div class="timeline-item comment">
 						<div class="content">
-							<div class="ui top attached header comment-header-left gt-df gt-ac arrow-top">
+							<div class="ui top attached header comment-header-left tw-flex tw-content-center arrow-top">
 								{{if gt .Poster.ID 0}}
 									<a class="inline-timeline-avatar" href="{{.Poster.HomeLink}}">
 										{{ctx.AvatarUtils.Avatar .Poster 24}}
diff --git a/templates/repo/issue/view_content/conversation.tmpl b/templates/repo/issue/view_content/conversation.tmpl
index d93589539c..83c8fc6ca3 100644
--- a/templates/repo/issue/view_content/conversation.tmpl
+++ b/templates/repo/issue/view_content/conversation.tmpl
@@ -6,8 +6,8 @@
 	{{$hasReview := and $comment.Review}}
 	{{$isReviewPending := and $hasReview (eq $comment.Review.Type 0)}}
 	<div class="ui segments conversation-holder">
-		<div class="ui segment collapsible-comment-box gt-py-3 gt-df gt-ac gt-sb">
-			<div class="gt-df gt-ac">
+		<div class="ui segment collapsible-comment-box gt-py-3 tw-flex tw-content-center tw-justify-between">
+			<div class="tw-flex tw-content-center">
 				<a href="{{$comment.CodeCommentLink ctx}}" class="file-comment gt-ml-3 gt-word-break">{{$comment.TreePath}}</a>
 				{{if $invalid}}
 					<span class="ui label basic small gt-ml-3" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.review.outdated_description"}}">
@@ -17,7 +17,7 @@
 			</div>
 			<div>
 				{{if or $invalid $resolved}}
-					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="{{if not $resolved}}gt-hidden {{end}}ui compact labeled button show-outdated gt-df gt-ac">
+					<button id="show-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="{{if not $resolved}}gt-hidden {{end}}ui compact labeled button show-outdated tw-flex tw-content-center">
 						{{svg "octicon-unfold" 16 "gt-mr-3"}}
 						{{if $resolved}}
 							{{ctx.Locale.Tr "repo.issues.review.show_resolved"}}
@@ -25,7 +25,7 @@
 							{{ctx.Locale.Tr "repo.issues.review.show_outdated"}}
 						{{end}}
 					</button>
-					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="{{if $resolved}}gt-hidden {{end}}ui compact labeled button hide-outdated gt-df gt-ac">
+					<button id="hide-outdated-{{$comment.ID}}" data-comment="{{$comment.ID}}" class="{{if $resolved}}gt-hidden {{end}}ui compact labeled button hide-outdated tw-flex tw-content-center">
 						{{svg "octicon-fold" 16 "gt-mr-3"}}
 						{{if $resolved}}
 							{{ctx.Locale.Tr "repo.issues.review.hide_resolved"}}
@@ -58,7 +58,7 @@
 					<div class="comment code-comment gt-pb-4" id="{{.HashTag}}">
 						<div class="content">
 							<div class="header comment-header">
-								<div class="comment-header-left gt-df gt-ac">
+								<div class="comment-header-left tw-flex tw-content-center">
 									{{if not .OriginalAuthor}}
 										<a class="avatar">
 											{{ctx.AvatarUtils.Avatar .Poster 20}}
@@ -79,7 +79,7 @@
 										{{ctx.Locale.Tr "repo.issues.commented_at" .HashTag $createdSubStr}}
 									</span>
 								</div>
-								<div class="comment-header-right actions gt-df gt-ac">
+								<div class="comment-header-right actions tw-flex tw-content-center">
 									{{template "repo/issue/view_content/show_role" dict "ShowRole" .ShowRole}}
 									{{if not $.Repository.IsArchived}}
 										{{template "repo/issue/view_content/add_reaction" dict "ctxData" $ "ActionURL" (printf "%s/comments/%d/reactions" $.RepoLink .ID)}}
@@ -109,8 +109,8 @@
 					</div>
 				{{end}}
 			</div>
-			<div class="code-comment-buttons gt-df gt-ac gt-fw gt-mt-3 gt-mb-2 gt-mx-3">
-				<div class="gt-f1">
+			<div class="code-comment-buttons tw-flex tw-content-center tw-flex-wrap gt-mt-3 gt-mb-2 gt-mx-3">
+				<div class="tw-flex-1">
 					{{if $resolved}}
 						<div class="ui grey text">
 							{{svg "octicon-check" 16 "gt-mr-2"}}
diff --git a/templates/repo/issue/view_content/pull.tmpl b/templates/repo/issue/view_content/pull.tmpl
index aac30180df..9fafeb5ee3 100644
--- a/templates/repo/issue/view_content/pull.tmpl
+++ b/templates/repo/issue/view_content/pull.tmpl
@@ -33,7 +33,7 @@
 		<div class="ui attached merge-section segment {{if not $.LatestCommitStatus}}no-header{{end}} flex-items-block">
 			{{if .Issue.PullRequest.HasMerged}}
 				{{if .IsPullBranchDeletable}}
-					<div class="item item-section text gt-f1">
+					<div class="item item-section text tw-flex-1">
 						<div class="item-section-left">
 							<h3 class="gt-mb-3">
 								{{ctx.Locale.Tr "repo.pulls.merged_success"}}
@@ -48,7 +48,7 @@
 					</div>
 				{{end}}
 			{{else if .Issue.IsClosed}}
-				<div class="item item-section text gt-f1">
+				<div class="item item-section text tw-flex-1">
 					<div class="item-section-left">
 						<h3 class="gt-mb-3">{{ctx.Locale.Tr "repo.pulls.closed"}}</h3>
 						<div class="merge-section-info">
@@ -82,7 +82,7 @@
 				</div>
 			{{else if .IsPullWorkInProgress}}
 				<div class="item toggle-wip" data-title="{{.Issue.Title}}" data-wip-prefix="{{.WorkInProgressPrefix}}" data-update-url="{{.Issue.Link}}/title">
-					<div class="item-section-left flex-text-inline gt-f1">
+					<div class="item-section-left flex-text-inline tw-flex-1">
 						{{svg "octicon-x"}}
 						{{ctx.Locale.Tr "repo.pulls.cannot_merge_work_in_progress"}}
 					</div>
diff --git a/templates/repo/issue/view_content/sidebar.tmpl b/templates/repo/issue/view_content/sidebar.tmpl
index 329a39dd69..b8867c11e7 100644
--- a/templates/repo/issue/view_content/sidebar.tmpl
+++ b/templates/repo/issue/view_content/sidebar.tmpl
@@ -3,7 +3,7 @@
 	{{if .Issue.IsPull}}
 		<input id="reviewer_id" name="reviewer_id" type="hidden" value="{{.reviewer_id}}">
 		<div class="ui {{if or (and (not .Reviewers) (not .TeamReviewers)) (not .CanChooseReviewer) .Repository.IsArchived}}disabled{{end}} floating jump select-reviewers-modify dropdown">
-			<a class="text gt-df gt-ac muted">
+			<a class="text tw-flex tw-content-center muted">
 				<strong>{{ctx.Locale.Tr "repo.issues.review.reviewers"}}</strong>
 				{{if and .CanChooseReviewer (not .Repository.IsArchived)}}
 					{{svg "octicon-gear" 16 "gt-ml-2"}}
@@ -50,17 +50,17 @@
 			<span class="no-select item {{if or .OriginalReviews .PullReviewers}}gt-hidden{{end}}">{{ctx.Locale.Tr "repo.issues.new.no_reviewers"}}</span>
 			<div class="selected">
 				{{range .PullReviewers}}
-					<div class="item gt-df gt-ac gt-py-3">
-						<div class="gt-df gt-ac gt-f1">
+					<div class="item tw-flex tw-content-center gt-py-3">
+						<div class="tw-flex tw-content-center tw-flex-1">
 							{{if .User}}
 								<a class="muted sidebar-item-link" href="{{.User.HomeLink}}">{{ctx.AvatarUtils.Avatar .User 20 "gt-mr-3"}}{{.User.GetDisplayName}}</a>
 							{{else if .Team}}
 								<span class="text">{{svg "octicon-people" 20 "gt-mr-3"}}{{$.Issue.Repo.OwnerName}}/{{.Team.Name}}</span>
 							{{end}}
 						</div>
-						<div class="gt-df gt-ac gt-gap-3">
+						<div class="tw-flex tw-content-center gt-gap-3">
 							{{if (and $.Permission.IsAdmin (or (eq .Review.Type 1) (eq .Review.Type 3)) (not $.Issue.IsClosed))}}
-								<a href="#" class="ui muted icon gt-df gt-ac show-modal" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dismiss_review"}}" data-modal="#dismiss-review-modal-{{.Review.ID}}">
+								<a href="#" class="ui muted icon tw-flex tw-content-center show-modal" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dismiss_review"}}" data-modal="#dismiss-review-modal-{{.Review.ID}}">
 									{{svg "octicon-x" 20}}
 								</a>
 								<div class="ui small modal" id="dismiss-review-modal-{{.Review.ID}}">
@@ -99,14 +99,14 @@
 					</div>
 				{{end}}
 				{{range .OriginalReviews}}
-					<div class="item gt-df gt-ac gt-py-3">
-						<div class="gt-df gt-ac gt-f1">
+					<div class="item tw-flex tw-content-center gt-py-3">
+						<div class="tw-flex tw-content-center tw-flex-1">
 							<a class="muted" href="{{$.Repository.OriginalURL}}" data-tooltip-content="{{ctx.Locale.Tr "repo.migrated_from_fake" $.Repository.GetOriginalURLHostname}}">
 								{{svg (MigrationIcon $.Repository.GetOriginalURLHostname) 20 "gt-mr-3"}}
 								{{.OriginalAuthor}}
 							</a>
 						</div>
-						<div class="gt-df gt-ac gt-gap-3">
+						<div class="tw-flex tw-content-center gt-gap-3">
 							{{svg (printf "octicon-%s" .Type.Icon) 16 (printf "text %s" (.HTMLTypeColorName))}}
 						</div>
 					</div>
@@ -257,7 +257,7 @@
 
 	{{if .Participants}}
 		<span class="text"><strong>{{ctx.Locale.Tr "repo.issues.num_participants" .NumParticipants}}</strong></span>
-		<div class="ui list gt-df gt-fw">
+		<div class="ui list tw-flex tw-flex-wrap">
 			{{range .Participants}}
 				<a {{if gt .ID 0}}href="{{.HomeLink}}"{{end}} data-tooltip-content="{{.GetDisplayName}}">
 					{{ctx.AvatarUtils.Avatar . 28 "gt-my-1 gt-mr-2"}}
@@ -361,7 +361,7 @@
 		</div>
 		{{if ne .Issue.DeadlineUnix 0}}
 			<p>
-				<div class="gt-df gt-sb gt-ac">
+				<div class="tw-flex tw-justify-between tw-content-center">
 					<div class="due-date {{if .Issue.IsOverdue}}text red{{end}}" {{if .Issue.IsOverdue}}data-tooltip-content="{{ctx.Locale.Tr "repo.issues.due_date_overdue"}}"{{end}}>
 						{{svg "octicon-calendar" 16 "gt-mr-3"}}
 						{{DateTime "long" .Issue.DeadlineUnix.FormatDate}}
@@ -417,8 +417,8 @@
 				</span>
 				<div class="ui relaxed divided list">
 					{{range .BlockingDependencies}}
-						<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} gt-df gt-ac gt-sb">
-							<div class="item-left gt-df gt-jc gt-fc gt-f1 gt-ellipsis">
+						<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} tw-flex tw-content-center tw-justify-between">
+							<div class="item-left tw-flex tw-justify-center tw-flex-col tw-flex-1 gt-ellipsis">
 								<a class="title muted" href="{{.Issue.Link}}" data-tooltip-content="#{{.Issue.Index}} {{.Issue.Title | RenderEmoji $.Context}}">
 									#{{.Issue.Index}} {{.Issue.Title | RenderEmoji $.Context}}
 								</a>
@@ -426,7 +426,7 @@
 									{{.Repository.OwnerName}}/{{.Repository.Name}}
 								</div>
 							</div>
-							<div class="item-right gt-df gt-ac gt-m-2">
+							<div class="item-right tw-flex tw-content-center gt-m-2">
 								{{if and $.CanCreateIssueDependencies (not $.Repository.IsArchived)}}
 									<a class="delete-dependency-button ci muted" data-id="{{.Issue.ID}}" data-type="blocking" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dependency.remove_info"}}">
 										{{svg "octicon-trash" 16}}
@@ -436,7 +436,7 @@
 						</div>
 					{{end}}
 					{{if .BlockingDependenciesNotPermitted}}
-						<div class="item gt-df gt-ac gt-sb gt-ellipsis">
+						<div class="item tw-flex tw-content-center tw-justify-between gt-ellipsis">
 							<span>{{ctx.Locale.TrN (len .BlockingDependenciesNotPermitted) "repo.issues.dependency.no_permission_1" "repo.issues.dependency.no_permission_n" (len .BlockingDependenciesNotPermitted)}}</span>
 						</div>
 					{{end}}
@@ -449,8 +449,8 @@
 				</span>
 				<div class="ui relaxed divided list">
 					{{range .BlockedByDependencies}}
-						<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} gt-df gt-ac gt-sb">
-							<div class="item-left gt-df gt-jc gt-fc gt-f1 gt-ellipsis">
+						<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} tw-flex tw-content-center tw-justify-between">
+							<div class="item-left tw-flex tw-justify-center tw-flex-col tw-flex-1 gt-ellipsis">
 								<a class="title muted" href="{{.Issue.Link}}" data-tooltip-content="#{{.Issue.Index}} {{.Issue.Title | RenderEmoji $.Context}}">
 									#{{.Issue.Index}} {{.Issue.Title | RenderEmoji $.Context}}
 								</a>
@@ -458,7 +458,7 @@
 									{{.Repository.OwnerName}}/{{.Repository.Name}}
 								</div>
 							</div>
-							<div class="item-right gt-df gt-ac gt-m-2">
+							<div class="item-right tw-flex tw-content-center gt-m-2">
 								{{if and $.CanCreateIssueDependencies (not $.Repository.IsArchived)}}
 									<a class="delete-dependency-button ci muted" data-id="{{.Issue.ID}}" data-type="blockedBy" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dependency.remove_info"}}">
 										{{svg "octicon-trash" 16}}
@@ -469,8 +469,8 @@
 					{{end}}
 					{{if $.CanCreateIssueDependencies}}
 						{{range .BlockedByDependenciesNotPermitted}}
-							<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} gt-df gt-ac gt-sb">
-								<div class="item-left gt-df gt-jc gt-fc gt-f1 gt-ellipsis">
+							<div class="item dependency{{if .Issue.IsClosed}} is-closed{{end}} tw-flex tw-content-center tw-justify-between">
+								<div class="item-left tw-flex tw-justify-center tw-flex-col tw-flex-1 gt-ellipsis">
 									<div class="gt-ellipsis">
 										<span data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dependency.no_permission.can_remove"}}">{{svg "octicon-lock" 16}}</span>
 										<span class="title" data-tooltip-content="#{{.Issue.Index}} {{.Issue.Title | RenderEmoji $.Context}}">
@@ -481,7 +481,7 @@
 										{{.Repository.OwnerName}}/{{.Repository.Name}}
 									</div>
 								</div>
-								<div class="item-right gt-df gt-ac gt-m-2">
+								<div class="item-right tw-flex tw-content-center gt-m-2">
 									{{if and $.CanCreateIssueDependencies (not $.Repository.IsArchived)}}
 										<a class="delete-dependency-button ci muted" data-id="{{.Issue.ID}}" data-type="blocking" data-tooltip-content="{{ctx.Locale.Tr "repo.issues.dependency.remove_info"}}">
 											{{svg "octicon-trash" 16}}
@@ -491,7 +491,7 @@
 							</div>
 						{{end}}
 					{{else if .BlockedByDependenciesNotPermitted}}
-						<div class="item gt-df gt-ac gt-sb gt-ellipsis">
+						<div class="item tw-flex tw-content-center tw-justify-between gt-ellipsis">
 							<span>{{ctx.Locale.TrN (len .BlockedByDependenciesNotPermitted) "repo.issues.dependency.no_permission_1" "repo.issues.dependency.no_permission_n" (len .BlockedByDependenciesNotPermitted)}}</span>
 						</div>
 					{{end}}
@@ -548,7 +548,7 @@
 	<div class="divider"></div>
 	<div class="ui equal width compact grid">
 		{{$issueReferenceLink := printf "%s#%d" .Issue.Repo.FullName .Issue.Index}}
-		<div class="row gt-ac" data-tooltip-content="{{$issueReferenceLink}}">
+		<div class="row tw-content-center" data-tooltip-content="{{$issueReferenceLink}}">
 			<span class="text column truncate">{{ctx.Locale.Tr "repo.issues.reference_link" $issueReferenceLink}}</span>
 			<button class="ui two wide button column gt-p-3" data-clipboard-text="{{$issueReferenceLink}}">{{svg "octicon-copy" 14}}</button>
 		</div>
diff --git a/templates/repo/issue/view_content/update_branch_by_merge.tmpl b/templates/repo/issue/view_content/update_branch_by_merge.tmpl
index 4dbefefe00..adce052dee 100644
--- a/templates/repo/issue/view_content/update_branch_by_merge.tmpl
+++ b/templates/repo/issue/view_content/update_branch_by_merge.tmpl
@@ -7,7 +7,7 @@
 		</div>
 		<div class="item-section-right">
 			{{if and $.UpdateAllowed $.UpdateByRebaseAllowed}}
-				<div class="gt-dib">
+				<div class="tw-inline-block">
 					<div class="ui buttons update-button">
 						<button class="ui button" data-do="{{$.Link}}/update" data-redirect="{{$.Link}}">
 							<span class="button-text">
diff --git a/templates/repo/issue/view_title.tmpl b/templates/repo/issue/view_title.tmpl
index 370826e0fd..4b5bf2ec0a 100644
--- a/templates/repo/issue/view_title.tmpl
+++ b/templates/repo/issue/view_title.tmpl
@@ -8,7 +8,7 @@
 		<h1 class="gt-word-break">
 			<span id="issue-title">{{RenderIssueTitle $.Context .Issue.Title ($.Repository.ComposeMetas ctx) | RenderCodeBlock}} <span class="index">#{{.Issue.Index}}</span>
 </span>
-			<div id="edit-title-input" class="ui input gt-f1 gt-hidden">
+			<div id="edit-title-input" class="ui input tw-flex-1 gt-hidden">
 				<input value="{{.Issue.Title}}" maxlength="255" autocomplete="off">
 			</div>
 		</h1>
diff --git a/templates/repo/migrate/migrate.tmpl b/templates/repo/migrate/migrate.tmpl
index 8ba567ee6b..c0336b9b97 100644
--- a/templates/repo/migrate/migrate.tmpl
+++ b/templates/repo/migrate/migrate.tmpl
@@ -5,7 +5,7 @@
 			{{template "repo/migrate/helper" .}}
 			<div class="ui cards migrate-entries">
 				{{range .Services}}
-					<a class="ui card migrate-entry gt-df gt-ac" href="{{AppSubUrl}}/repo/migrate?service_type={{.}}&org={{$.Org}}&mirror={{$.Mirror}}">
+					<a class="ui card migrate-entry tw-flex tw-content-center" href="{{AppSubUrl}}/repo/migrate?service_type={{.}}&org={{$.Org}}&mirror={{$.Mirror}}">
 						{{if eq .Name "github"}}
 							{{svg "octicon-mark-github" 184 "gt-p-4"}}
 						{{else if eq .Name "gitlab"}}
diff --git a/templates/repo/projects/view.tmpl b/templates/repo/projects/view.tmpl
index 377a7ff79f..b227ce4439 100644
--- a/templates/repo/projects/view.tmpl
+++ b/templates/repo/projects/view.tmpl
@@ -2,7 +2,7 @@
 <div role="main" aria-label="{{.Title}}" class="page-content repository projects view-project">
 	{{template "repo/header" .}}
 	<div class="ui container padded">
-		<div class="gt-df gt-sb gt-ac gt-mb-4">
+		<div class="tw-flex tw-justify-between tw-content-center gt-mb-4">
 			{{template "repo/issue/navbar" .}}
 			<a class="ui small primary button" href="{{.RepoLink}}/issues/new/choose?project={{.Project.ID}}">{{ctx.Locale.Tr "repo.issues.new"}}</a>
 		</div>
diff --git a/templates/repo/pulls/fork.tmpl b/templates/repo/pulls/fork.tmpl
index f0907f409b..2cf0a85fc8 100644
--- a/templates/repo/pulls/fork.tmpl
+++ b/templates/repo/pulls/fork.tmpl
@@ -37,7 +37,7 @@
 
 					<div class="inline field">
 						<label>{{ctx.Locale.Tr "repo.fork_from"}}</label>
-						<a href="{{.ForkRepo.Link}}" class="gt-dib">{{.ForkRepo.FullName}}</a>
+						<a href="{{.ForkRepo.Link}}" class="tw-inline-block">{{.ForkRepo.FullName}}</a>
 					</div>
 					<div class="inline required field {{if .Err_RepoName}}error{{end}}">
 						<label for="repo_name">{{ctx.Locale.Tr "repo.repo_name"}}</label>
diff --git a/templates/repo/pulls/tab_menu.tmpl b/templates/repo/pulls/tab_menu.tmpl
index 340b1bb397..fb00acde32 100644
--- a/templates/repo/pulls/tab_menu.tmpl
+++ b/templates/repo/pulls/tab_menu.tmpl
@@ -15,7 +15,7 @@
 			{{ctx.Locale.Tr "repo.pulls.tab_files"}}
 			<span class="ui small label">{{if .NumFiles}}{{.NumFiles}}{{else}}-{{end}}</span>
 		</a>
-		<span class="item tw-ml-auto gt-pr-0 gt-font-bold gt-df gt-ac gt-gap-3">
+		<span class="item tw-ml-auto gt-pr-0 gt-font-bold tw-flex tw-content-center gt-gap-3">
 			<span><span class="text green">{{if .Diff.TotalAddition}}+{{.Diff.TotalAddition}}{{end}}</span> <span class="text red">{{if .Diff.TotalDeletion}}-{{.Diff.TotalDeletion}}{{end}}</span></span>
 			<span class="diff-stats-bar">
 				<div class="diff-stats-add-bar" style="width: {{Eval 100 "*" .Diff.TotalAddition "/" "(" .Diff.TotalAddition "+" .Diff.TotalDeletion "+" 0.0 ")"}}%"></div>
diff --git a/templates/repo/release/list.tmpl b/templates/repo/release/list.tmpl
index 873cccab79..29059ea4a4 100644
--- a/templates/repo/release/list.tmpl
+++ b/templates/repo/release/list.tmpl
@@ -16,10 +16,10 @@
 						{{end}}
 					</div>
 					<div class="ui twelve wide column detail">
-						<div class="gt-df gt-ac gt-sb gt-fw gt-mb-3">
+						<div class="tw-flex tw-content-center tw-justify-between tw-flex-wrap gt-mb-3">
 							<h4 class="release-list-title gt-word-break">
 								{{if $.PageIsSingleTag}}{{$release.Title}}{{else}}<a href="{{$.RepoLink}}/releases/tag/{{$release.TagName | PathEscapeSegments}}">{{$release.Title}}</a>{{end}}
-								{{template "repo/commit_statuses" dict "Status" $info.CommitStatus "Statuses" $info.CommitStatuses "AdditionalClasses" "gt-df"}}
+								{{template "repo/commit_statuses" dict "Status" $info.CommitStatus "Statuses" $info.CommitStatuses "AdditionalClasses" "tw-flex"}}
 								{{if $release.IsDraft}}
 									<span class="ui yellow label">{{ctx.Locale.Tr "repo.release.draft"}}</span>
 								{{else if $release.IsPrerelease}}
diff --git a/templates/repo/release/new.tmpl b/templates/repo/release/new.tmpl
index 30e783167c..fd6338a701 100644
--- a/templates/repo/release/new.tmpl
+++ b/templates/repo/release/new.tmpl
@@ -21,7 +21,7 @@
 					{{else}}
 						<input id="tag-name" name="tag_name" value="{{.tag_name}}" aria-label="{{ctx.Locale.Tr "repo.release.tag_name"}}" placeholder="{{ctx.Locale.Tr "repo.release.tag_name"}}" autofocus required maxlength="255">
 						<input id="tag-name-editor" type="hidden" data-existing-tags="{{JsonUtils.EncodeToString .Tags}}" data-tag-helper="{{ctx.Locale.Tr "repo.release.tag_helper"}}" data-tag-helper-new="{{ctx.Locale.Tr "repo.release.tag_helper_new"}}" data-tag-helper-existing="{{ctx.Locale.Tr "repo.release.tag_helper_existing"}}">
-						<div id="tag-target-selector" class="gt-dib">
+						<div id="tag-target-selector" class="tw-inline-block">
 							<span class="at">@</span>
 							<div class="ui selection dropdown">
 								<input type="hidden" name="tag_target" value="{{.tag_target}}">
@@ -61,7 +61,7 @@
 				</div>
 				{{range .attachments}}
 					<div class="field flex-text-block" id="attachment-{{.ID}}">
-						<div class="flex-text-inline gt-f1">
+						<div class="flex-text-inline tw-flex-1">
 							<input name="attachment-edit-{{.UUID}}"  class="attachment_edit" required value="{{.Name}}">
 							<input name="attachment-del-{{.UUID}}" type="hidden" value="false">
 							<span class="ui text grey tw-whitespace-nowrap">{{.Size | FileSize}}</span>
@@ -101,7 +101,7 @@
 					</div>
 					<span class="help">{{ctx.Locale.Tr "repo.release.prerelease_helper"}}</span>
 					<div class="divider gt-mt-0"></div>
-					<div class="gt-df gt-je">
+					<div class="tw-flex tw-justify-end">
 						{{if .PageIsEditRelease}}
 							<a class="ui small button" href="{{.RepoLink}}/releases">
 								{{ctx.Locale.Tr "repo.release.cancel"}}
diff --git a/templates/repo/release_tag_header.tmpl b/templates/repo/release_tag_header.tmpl
index 8e6088790d..18a3c8c6b8 100644
--- a/templates/repo/release_tag_header.tmpl
+++ b/templates/repo/release_tag_header.tmpl
@@ -2,8 +2,8 @@
 {{$canReadCode := $.Permission.CanRead $.UnitTypeCode}}
 
 {{if $canReadReleases}}
-	<div class="gt-df">
-		<div class="gt-f1 gt-df gt-ac">
+	<div class="tw-flex">
+		<div class="tw-flex-1 tw-flex tw-content-center">
 			<h2 class="ui compact small menu header small-menu-items">
 				<a class="{{if and .PageIsReleaseList (not .PageIsSingleTag)}}active {{end}}item" href="{{.RepoLink}}/releases">{{ctx.Locale.PrettyNumber .NumReleases}} {{ctx.Locale.TrN .NumReleases "repo.release" "repo.releases"}}</a>
 				{{if $canReadCode}}
diff --git a/templates/repo/settings/branches.tmpl b/templates/repo/settings/branches.tmpl
index 73aff887f3..2610ae02fe 100644
--- a/templates/repo/settings/branches.tmpl
+++ b/templates/repo/settings/branches.tmpl
@@ -12,11 +12,11 @@
 				<p>
 					{{ctx.Locale.Tr "repo.settings.default_branch_desc"}}
 				</p>
-				<form class="gt-df" action="{{.Link}}" method="post">
+				<form class="tw-flex" action="{{.Link}}" method="post">
 					{{.CsrfTokenHtml}}
 					<input type="hidden" name="action" value="default_branch">
 					{{if not .Repository.IsEmpty}}
-						<div class="ui dropdown selection search gt-f1 gt-mr-3 tw-max-w-96">
+						<div class="ui dropdown selection search tw-flex-1 gt-mr-3 tw-max-w-96">
 							{{svg "octicon-triangle-down" 14 "dropdown icon"}}
 							<input type="hidden" name="branch" value="{{.Repository.DefaultBranch}}">
 							<div class="default text">{{.Repository.DefaultBranch}}</div>
@@ -41,7 +41,7 @@
 			<div class="ui attached segment">
 				<div class="flex-list">
 					{{range .ProtectedBranches}}
-						<div class="flex-item gt-ac">
+						<div class="flex-item tw-content-center">
 							<div class="flex-item-main">
 								<div class="flex-item-title">
 									<div class="ui basic primary label">{{.RuleName}}</div>
diff --git a/templates/repo/settings/collaboration.tmpl b/templates/repo/settings/collaboration.tmpl
index d7b5c96bab..8783de2544 100644
--- a/templates/repo/settings/collaboration.tmpl
+++ b/templates/repo/settings/collaboration.tmpl
@@ -7,7 +7,7 @@
 		<div class="ui attached segment">
 			<div class="flex-list">
 				{{range .Collaborators}}
-					<div class="flex-item gt-ac">
+					<div class="flex-item tw-content-center">
 						<div class="flex-item-leading">
 							<a href="{{.HomeLink}}">{{ctx.AvatarUtils.Avatar . 32}}</a>
 						</div>
@@ -41,7 +41,7 @@
 		<div class="ui bottom attached segment">
 			<form class="ui form" id="repo-collab-form" action="{{.Link}}" method="post">
 				{{.CsrfTokenHtml}}
-				<div id="search-user-box" class="ui search input gt-vm">
+				<div id="search-user-box" class="ui search input tw-align-middle">
 					<input class="prompt" name="collaborator" placeholder="{{ctx.Locale.Tr "search.team_kind"}}" autocomplete="off" autofocus required>
 				</div>
 				<button class="ui primary button">{{ctx.Locale.Tr "repo.settings.add_collaborator"}}</button>
@@ -89,7 +89,7 @@
 			{{if $allowedToChangeTeams}}
 				<form class="ui form" id="repo-collab-team-form" action="{{.Link}}/team" method="post">
 					{{.CsrfTokenHtml}}
-					<div id="search-team-box" class="ui search input gt-vm" data-org-name="{{.OrgName}}">
+					<div id="search-team-box" class="ui search input tw-align-middle" data-org-name="{{.OrgName}}">
 						<input class="prompt" name="team" placeholder="{{ctx.Locale.Tr "search.team_kind"}}" autocomplete="off" autofocus required>
 					</div>
 					<button class="ui primary button">{{ctx.Locale.Tr "repo.settings.add_team"}}</button>
diff --git a/templates/repo/settings/githooks.tmpl b/templates/repo/settings/githooks.tmpl
index 3fce29d545..3d15d097cc 100644
--- a/templates/repo/settings/githooks.tmpl
+++ b/templates/repo/settings/githooks.tmpl
@@ -11,7 +11,7 @@
 				{{range .Hooks}}
 					<div class="item truncated-item-container">
 						<span class="text {{if .IsActive}}green{{else}}grey{{end}} gt-mr-3">{{svg "octicon-dot-fill" 22}}</span>
-						<span class="text truncate gt-f1 gt-mr-3">{{.Name}}</span>
+						<span class="text truncate tw-flex-1 gt-mr-3">{{.Name}}</span>
 						<a class="muted tw-float-right gt-p-3" href="{{$.RepoLink}}/settings/hooks/git/{{.Name|PathEscape}}">
 							{{svg "octicon-pencil"}}
 						</a>
diff --git a/templates/repo/settings/options.tmpl b/templates/repo/settings/options.tmpl
index 604e5d4152..aa40a1cd1b 100644
--- a/templates/repo/settings/options.tmpl
+++ b/templates/repo/settings/options.tmpl
@@ -132,7 +132,7 @@
 								<td>{{ctx.Locale.Tr "repo.settings.mirror_settings.direction.pull"}}</td>
 								<td>{{DateTime "full" .PullMirror.UpdatedUnix}}</td>
 								<td class="right aligned">
-									<form method="post" class="gt-dib">
+									<form method="post" class="tw-inline-block">
 										{{.CsrfTokenHtml}}
 										<input type="hidden" name="action" value="mirror-sync">
 										<button class="ui primary tiny button inline text-thin">{{ctx.Locale.Tr "repo.settings.sync_mirror"}}</button>
@@ -230,13 +230,13 @@
 									>
 										{{svg "octicon-pencil" 14}}
 									</button>
-									<form method="post" class="gt-dib">
+									<form method="post" class="tw-inline-block">
 										{{$.CsrfTokenHtml}}
 										<input type="hidden" name="action" value="push-mirror-sync">
 										<input type="hidden" name="push_mirror_id" value="{{.ID}}">
 										<button class="ui primary tiny button" data-tooltip-content="{{ctx.Locale.Tr "repo.settings.sync_mirror"}}">{{svg "octicon-sync" 14}}</button>
 									</form>
-									<form method="post" class="gt-dib">
+									<form method="post" class="tw-inline-block">
 										{{$.CsrfTokenHtml}}
 										<input type="hidden" name="action" value="push-mirror-remove">
 										<input type="hidden" name="push_mirror_id" value="{{.ID}}">
@@ -837,7 +837,7 @@
 					</div>
 				</div>
 				{{if not .Repository.IsMirror}}
-					<div class="flex-item gt-ac">
+					<div class="flex-item tw-content-center">
 						<div class="flex-item-main">
 							{{if .Repository.IsArchived}}
 								<div class="flex-item-title">{{ctx.Locale.Tr "repo.settings.unarchive.header"}}</div>
diff --git a/templates/repo/settings/tags.tmpl b/templates/repo/settings/tags.tmpl
index 4c196f0f99..c9efb7b67e 100644
--- a/templates/repo/settings/tags.tmpl
+++ b/templates/repo/settings/tags.tmpl
@@ -106,7 +106,7 @@
 										</td>
 										<td class="right aligned">
 											<a class="ui tiny primary button" href="{{$.RepoLink}}/settings/tags/{{.ID}}">{{ctx.Locale.Tr "edit"}}</a>
-											<form class="gt-dib" action="{{$.RepoLink}}/settings/tags/delete" method="post">
+											<form class="tw-inline-block" action="{{$.RepoLink}}/settings/tags/delete" method="post">
 												{{$.CsrfTokenHtml}}
 												<input type="hidden" name="id" value="{{.ID}}">
 												<button class="ui tiny red button">{{ctx.Locale.Tr "remove"}}</button>
diff --git a/templates/repo/settings/webhook/base_list.tmpl b/templates/repo/settings/webhook/base_list.tmpl
index e56929b70f..9abc03e40e 100644
--- a/templates/repo/settings/webhook/base_list.tmpl
+++ b/templates/repo/settings/webhook/base_list.tmpl
@@ -15,7 +15,7 @@
 		{{range .Webhooks}}
 			<div class="item truncated-item-container">
 				<span class="text {{if eq .LastStatus 1}}green{{else if eq .LastStatus 2}}red{{else}}grey{{end}} gt-mr-3">{{svg "octicon-dot-fill" 22}}</span>
-				<div class="text truncate gt-f1 gt-mr-3">
+				<div class="text truncate tw-flex-1 gt-mr-3">
 					<a title="{{.URL}}" href="{{$.BaseLink}}/{{.ID}}">{{.URL}}</a>
 				</div>
 				<a class="muted gt-p-3" href="{{$.BaseLink}}/{{.ID}}">{{svg "octicon-pencil"}}</a>
diff --git a/templates/repo/settings/webhook/history.tmpl b/templates/repo/settings/webhook/history.tmpl
index 9f7a7816ea..e2aee13941 100644
--- a/templates/repo/settings/webhook/history.tmpl
+++ b/templates/repo/settings/webhook/history.tmpl
@@ -17,7 +17,7 @@
 		<div class="ui list">
 			{{range .History}}
 				<div class="item">
-					<div class="flex-text-block gt-sb">
+					<div class="flex-text-block tw-justify-between">
 						<div class="flex-text-inline">
 							{{if .IsSucceed}}
 								<span class="text green">{{svg "octicon-check"}}</span>
diff --git a/templates/repo/tag/list.tmpl b/templates/repo/tag/list.tmpl
index 9f0676e395..0348334623 100644
--- a/templates/repo/tag/list.tmpl
+++ b/templates/repo/tag/list.tmpl
@@ -5,7 +5,7 @@
 		{{template "base/alert" .}}
 		{{template "repo/release_tag_header" .}}
 		<h4 class="ui top attached header">
-			<div class="five wide column gt-df gt-ac">
+			<div class="five wide column tw-flex tw-content-center">
 				{{svg "octicon-tag" 16 "gt-mr-2"}}{{ctx.Locale.Tr "repo.release.tags"}}
 			</div>
 		</h4>
@@ -18,12 +18,12 @@
 							<td class="tag">
 								<h3 class="release-tag-name gt-mb-3">
 									{{if $canReadReleases}}
-										<a class="gt-df gt-ac" href="{{$.RepoLink}}/releases/tag/{{.TagName | PathEscapeSegments}}" rel="nofollow">{{.TagName}}</a>
+										<a class="tw-flex tw-content-center" href="{{$.RepoLink}}/releases/tag/{{.TagName | PathEscapeSegments}}" rel="nofollow">{{.TagName}}</a>
 									{{else}}
-										<a class="gt-df gt-ac" href="{{$.RepoLink}}/src/tag/{{.TagName | PathEscapeSegments}}" rel="nofollow">{{.TagName}}</a>
+										<a class="tw-flex tw-content-center" href="{{$.RepoLink}}/src/tag/{{.TagName | PathEscapeSegments}}" rel="nofollow">{{.TagName}}</a>
 									{{end}}
 								</h3>
-								<div class="download gt-df gt-ac">
+								<div class="download tw-flex tw-content-center">
 									{{if $.Permission.CanRead $.UnitTypeCode}}
 										{{if .CreatedUnix}}
 											<span class="gt-mr-3">{{svg "octicon-clock" 16 "gt-mr-2"}}{{TimeSinceUnix .CreatedUnix ctx.Locale}}</span>
diff --git a/templates/repo/view_file.tmpl b/templates/repo/view_file.tmpl
index 8c1e7982eb..d8ef710400 100644
--- a/templates/repo/view_file.tmpl
+++ b/templates/repo/view_file.tmpl
@@ -25,8 +25,8 @@
 		</div>
 	{{end}}
 
-	<h4 class="file-header ui top attached header gt-df gt-ac gt-sb gt-fw">
-		<div class="file-header-left gt-df gt-ac gt-py-3 gt-pr-4">
+	<h4 class="file-header ui top attached header tw-flex tw-content-center tw-justify-between tw-flex-wrap">
+		<div class="file-header-left tw-flex tw-content-center gt-py-3 gt-pr-4">
 			{{if .ReadmeInList}}
 				{{svg "octicon-book" 16 "gt-mr-3"}}
 				<strong><a class="default-link muted" href="#readme">{{.FileName}}</a></strong>
@@ -34,7 +34,7 @@
 				{{template "repo/file_info" .}}
 			{{end}}
 		</div>
-		<div class="file-header-right file-actions gt-df gt-ac gt-fw">
+		<div class="file-header-right file-actions tw-flex tw-content-center tw-flex-wrap">
 			{{if .HasSourceRenderedToggle}}
 				<div class="ui compact icon buttons">
 					<a href="?display=source" class="ui mini basic button {{if .IsDisplayingSource}}active{{end}}" data-tooltip-content="{{ctx.Locale.Tr "repo.file_view_source"}}">{{svg "octicon-code" 15}}</a>
diff --git a/templates/repo/wiki/new.tmpl b/templates/repo/wiki/new.tmpl
index 411c7fc869..d1abd27342 100644
--- a/templates/repo/wiki/new.tmpl
+++ b/templates/repo/wiki/new.tmpl
@@ -3,7 +3,7 @@
 	{{template "repo/header" .}}
 	<div class="ui container">
 		{{template "base/alert" .}}
-		<div class="ui header flex-text-block gt-sb">
+		<div class="ui header flex-text-block tw-justify-between">
 			{{ctx.Locale.Tr "repo.wiki.new_page"}}
 			{{if .PageIsWikiEdit}}
 				<a class="ui tiny primary button" href="{{.RepoLink}}/wiki?action=_new">{{ctx.Locale.Tr "repo.wiki.new_page_button"}}</a>
diff --git a/templates/repo/wiki/pages.tmpl b/templates/repo/wiki/pages.tmpl
index cace0d48e0..fa7352e510 100644
--- a/templates/repo/wiki/pages.tmpl
+++ b/templates/repo/wiki/pages.tmpl
@@ -2,7 +2,7 @@
 <div role="main" aria-label="{{.Title}}" class="page-content repository wiki pages">
 	{{template "repo/header" .}}
 	<div class="ui container">
-		<h2 class="ui header gt-df gt-ac gt-sb">
+		<h2 class="ui header tw-flex tw-content-center tw-justify-between">
 			<span>{{ctx.Locale.Tr "repo.wiki.pages"}}</span>
 			<span>
 				{{if and .CanWriteWiki (not .Repository.IsMirror)}}
diff --git a/templates/repo/wiki/view.tmpl b/templates/repo/wiki/view.tmpl
index fefa9c589e..aa05a97fb0 100644
--- a/templates/repo/wiki/view.tmpl
+++ b/templates/repo/wiki/view.tmpl
@@ -4,7 +4,7 @@
 	{{$title := .title}}
 	<div class="ui container">
 		<div class="repo-button-row">
-			<div class="gt-df gt-ac">
+			<div class="tw-flex tw-content-center">
 				<div class="ui floating filter dropdown" data-no-results="{{ctx.Locale.Tr "no_results_found"}}">
 					<div class="ui basic small button">
 						<span class="text">
diff --git a/templates/shared/actions/runner_edit.tmpl b/templates/shared/actions/runner_edit.tmpl
index fbc730b288..f8bbf23b62 100644
--- a/templates/shared/actions/runner_edit.tmpl
+++ b/templates/shared/actions/runner_edit.tmpl
@@ -7,15 +7,15 @@
 			{{template "base/disable_form_autofill"}}
 			{{.CsrfTokenHtml}}
 			<div class="runner-basic-info">
-				<div class="field gt-dib gt-mr-4">
+				<div class="field tw-inline-block gt-mr-4">
 					<label>{{ctx.Locale.Tr "actions.runners.status"}}</label>
 					<span class="ui {{if .Runner.IsOnline}}green{{else}}basic{{end}} label">{{.Runner.StatusLocaleName ctx.Locale}}</span>
 				</div>
-				<div class="field gt-dib gt-mr-4">
+				<div class="field tw-inline-block gt-mr-4">
 					<label>{{ctx.Locale.Tr "actions.runners.last_online"}}</label>
 					<span>{{if .Runner.LastOnline}}{{TimeSinceUnix .Runner.LastOnline ctx.Locale}}{{else}}{{ctx.Locale.Tr "never"}}{{end}}</span>
 				</div>
-				<div class="field gt-dib gt-mr-4">
+				<div class="field tw-inline-block gt-mr-4">
 					<label>{{ctx.Locale.Tr "actions.runners.labels"}}</label>
 					<span>
 						{{range .Runner.AgentLabels}}
@@ -23,7 +23,7 @@
 						{{end}}
 					</span>
 				</div>
-				<div class="field gt-dib gt-mr-4">
+				<div class="field tw-inline-block gt-mr-4">
 					<label>{{ctx.Locale.Tr "actions.runners.owner_type"}}</label>
 					<span data-tooltip-content="{{.Runner.BelongsToOwnerName}}">{{.Runner.BelongsToOwnerType.LocaleString ctx.Locale}}</span>
 				</div>
diff --git a/templates/shared/search/code/results.tmpl b/templates/shared/search/code/results.tmpl
index 68b183e9bf..3bae959006 100644
--- a/templates/shared/search/code/results.tmpl
+++ b/templates/shared/search/code/results.tmpl
@@ -1,4 +1,4 @@
-<div class="flex-text-block gt-fw">
+<div class="flex-text-block tw-flex-wrap">
 	{{range $term := .SearchResultLanguages}}
 	<a class="ui {{if eq $.Language $term.Language}}primary{{end}} basic label gt-m-0"
 		href="?q={{$.Keyword}}{{if ne $.Language $term.Language}}&l={{$term.Language}}{{end}}&fuzzy={{$.IsFuzzy}}">
@@ -12,9 +12,9 @@
 	{{range $result := .SearchResults}}
 		{{$repo := or $.Repo (index $.RepoMaps .RepoID)}}
 		<div class="diff-file-box diff-box file-content non-diff-file-content repo-search-result">
-			<h4 class="ui top attached normal header gt-df gt-fw">
+			<h4 class="ui top attached normal header tw-flex tw-flex-wrap">
 				{{if not $.Repo}}
-					<span class="file gt-f1">
+					<span class="file tw-flex-1">
 						<a rel="nofollow" href="{{$repo.Link}}">{{$repo.FullName}}</a>
 						{{if $repo.IsArchived}}
 							<span class="ui basic label">{{ctx.Locale.Tr "repo.desc.archived"}}</span>
@@ -22,7 +22,7 @@
 						- {{.Filename}}
 					</span>
 				{{else}}
-					<span class="file gt-f1">{{.Filename}}</span>
+					<span class="file tw-flex-1">{{.Filename}}</span>
 				{{end}}
 				<a role="button" class="ui basic tiny button" rel="nofollow" href="{{$repo.Link}}/src/commit/{{$result.CommitID | PathEscape}}/{{.Filename | PathEscapeSegments}}">{{ctx.Locale.Tr "repo.diff.view_file"}}</a>
 			</h4>
diff --git a/templates/shared/searchbottom.tmpl b/templates/shared/searchbottom.tmpl
index b123b497c7..b920e10bb2 100644
--- a/templates/shared/searchbottom.tmpl
+++ b/templates/shared/searchbottom.tmpl
@@ -1,5 +1,5 @@
-<div class="ui bottom attached table segment gt-df gt-ac gt-sb">
-		<div class="gt-df gt-ac gt-ml-4">
+<div class="ui bottom attached table segment tw-flex tw-content-center tw-justify-between">
+		<div class="tw-flex tw-content-center gt-ml-4">
 			{{if .result.Language}}
 					<i class="color-icon gt-mr-3" style="background-color: {{.result.Color}}"></i>{{.result.Language}}
 			{{end}}
diff --git a/templates/shared/secrets/add_list.tmpl b/templates/shared/secrets/add_list.tmpl
index 4fbd8ddcfd..ea36d0cec2 100644
--- a/templates/shared/secrets/add_list.tmpl
+++ b/templates/shared/secrets/add_list.tmpl
@@ -14,7 +14,7 @@
 	{{if .Secrets}}
 	<div class="flex-list">
 		{{range .Secrets}}
-		<div class="flex-item gt-ac">
+		<div class="flex-item tw-content-center">
 			<div class="flex-item-leading">
 				{{svg "octicon-key" 32}}
 			</div>
diff --git a/templates/shared/user/org_profile_avatar.tmpl b/templates/shared/user/org_profile_avatar.tmpl
index a8846b0abd..07e7b8aed5 100644
--- a/templates/shared/user/org_profile_avatar.tmpl
+++ b/templates/shared/user/org_profile_avatar.tmpl
@@ -2,7 +2,7 @@
 	<div class="ui container">
 		<div class="ui vertically grid head">
 			<div class="column">
-				<div class="ui header gt-df gt-ac gt-word-break">
+				<div class="ui header tw-flex tw-content-center gt-word-break">
 					{{ctx.AvatarUtils.Avatar . 100}}
 					<span class="text thin grey"><a href="{{.HomeLink}}">{{.DisplayName}}</a></span>
 					<span class="org-visibility">
diff --git a/templates/shared/user/profile_big_avatar.tmpl b/templates/shared/user/profile_big_avatar.tmpl
index a168e6903e..3e1cacd9ba 100644
--- a/templates/shared/user/profile_big_avatar.tmpl
+++ b/templates/shared/user/profile_big_avatar.tmpl
@@ -1,5 +1,5 @@
 <div id="profile-avatar-card" class="ui card">
-	<div id="profile-avatar" class="content gt-df">
+	<div id="profile-avatar" class="content tw-flex">
 	{{if eq .SignedUserID .ContextUser.ID}}
 		<a class="image" href="{{AppSubUrl}}/user/settings" data-tooltip-content="{{ctx.Locale.Tr "user.change_avatar"}}">
 			{{/* the size doesn't take affect (and no need to take affect), image size(width) should be controlled by the parent container since this is not a flex layout*/}}
@@ -36,7 +36,7 @@
 			{{if .ContextUser.Location}}
 				<li>
 					{{svg "octicon-location"}}
-					<span class="gt-f1">{{.ContextUser.Location}}</span>
+					<span class="tw-flex-1">{{.ContextUser.Location}}</span>
 					{{if .ContextUserLocationMapURL}}
 						<a href="{{.ContextUserLocationMapURL}}" rel="nofollow noreferrer" data-tooltip-content="{{ctx.Locale.Tr "user.show_on_map"}}">
 							{{svg "octicon-link-external"}}
@@ -47,7 +47,7 @@
 			{{if (eq .SignedUserID .ContextUser.ID)}}
 				<li>
 					{{svg "octicon-mail"}}
-					<a class="gt-f1" href="mailto:{{.ContextUser.Email}}" rel="nofollow">{{.ContextUser.Email}}</a>
+					<a class="tw-flex-1" href="mailto:{{.ContextUser.Email}}" rel="nofollow">{{.ContextUser.Email}}</a>
 					<a href="{{AppSubUrl}}/user/settings#privacy-user-settings">
 						{{if .ShowUserEmail}}
 							<i data-tooltip-content="{{ctx.Locale.Tr "user.email_visibility.limited"}}">
diff --git a/templates/shared/variables/variable_list.tmpl b/templates/shared/variables/variable_list.tmpl
index 8e262d016c..dc8c7d7a80 100644
--- a/templates/shared/variables/variable_list.tmpl
+++ b/templates/shared/variables/variable_list.tmpl
@@ -16,7 +16,7 @@
 	{{if .Variables}}
 	<div class="flex-list">
 		{{range .Variables}}
-		<div class="flex-item gt-ac">
+		<div class="flex-item tw-content-center">
 			<div class="flex-item-leading">
 				{{svg "octicon-pencil" 32}}
 			</div>
diff --git a/templates/status/500.tmpl b/templates/status/500.tmpl
index 29de861a25..106529ca72 100644
--- a/templates/status/500.tmpl
+++ b/templates/status/500.tmpl
@@ -17,8 +17,8 @@
 <body>
 	<div class="full height">
 		<nav class="ui secondary menu">
-			<div class="ui container gt-df">
-				<div class="item gt-f1">
+			<div class="ui container tw-flex">
+				<div class="item tw-flex-1">
 					<a href="{{AppSubUrl}}/" aria-label="{{ctx.Locale.Tr "home"}}">
 						<img width="30" height="30" src="{{AssetUrlPrefix}}/img/logo.svg" alt="{{ctx.Locale.Tr "logo"}}" aria-hidden="true">
 					</a>
diff --git a/templates/user/auth/signin_inner.tmpl b/templates/user/auth/signin_inner.tmpl
index d7d3649a4d..f8eb81423c 100644
--- a/templates/user/auth/signin_inner.tmpl
+++ b/templates/user/auth/signin_inner.tmpl
@@ -54,10 +54,10 @@
 		{{ctx.Locale.Tr "sign_in_or"}}
 	</div>
 	<div id="oauth2-login-navigator" class="gt-py-2">
-		<div class="gt-df gt-fc gt-jc">
-			<div id="oauth2-login-navigator-inner" class="gt-df gt-fc gt-fw gt-ac gt-gap-3">
+		<div class="tw-flex tw-flex-col tw-justify-center">
+			<div id="oauth2-login-navigator-inner" class="tw-flex tw-flex-col tw-flex-wrap tw-content-center gt-gap-3">
 				{{range $provider := .OAuth2Providers}}
-					<a class="{{$provider.Name}} ui button gt-df gt-ac gt-jc gt-py-3 tw-w-full oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$provider.DisplayName}}">
+					<a class="{{$provider.Name}} ui button tw-flex tw-content-center tw-justify-center gt-py-3 tw-w-full oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$provider.DisplayName}}">
 						{{$provider.IconHTML 28}}
 						{{ctx.Locale.Tr "sign_in_with_provider" $provider.DisplayName}}
 					</a>
diff --git a/templates/user/auth/signup_inner.tmpl b/templates/user/auth/signup_inner.tmpl
index cfd826a0ce..a911537996 100644
--- a/templates/user/auth/signup_inner.tmpl
+++ b/templates/user/auth/signup_inner.tmpl
@@ -59,10 +59,10 @@
 				{{ctx.Locale.Tr "sign_in_or"}}
 			</div>
 			<div id="oauth2-login-navigator" class="gt-py-2">
-				<div class="gt-df gt-fc gt-jc">
-					<div id="oauth2-login-navigator-inner" class="gt-df gt-fc gt-fw gt-ac gt-gap-3">
+				<div class="tw-flex tw-flex-col tw-justify-center">
+					<div id="oauth2-login-navigator-inner" class="tw-flex tw-flex-col tw-flex-wrap tw-content-center gt-gap-3">
 						{{range $provider := .OAuth2Providers}}
-							<a class="{{$provider.Name}} ui button gt-df gt-ac gt-jc gt-py-3 tw-w-full oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$provider.DisplayName}}">
+							<a class="{{$provider.Name}} ui button tw-flex tw-content-center tw-justify-center gt-py-3 tw-w-full oauth-login-link" href="{{AppSubUrl}}/user/oauth2/{{$provider.DisplayName}}">
 								{{$provider.IconHTML 28}}
 								{{ctx.Locale.Tr "sign_in_with_provider" $provider.DisplayName}}
 							</a>
diff --git a/templates/user/auth/webauthn.tmpl b/templates/user/auth/webauthn.tmpl
index 722da02f54..375ebba9ae 100644
--- a/templates/user/auth/webauthn.tmpl
+++ b/templates/user/auth/webauthn.tmpl
@@ -10,7 +10,7 @@
 				{{template "base/alert" .}}
 				<p>{{ctx.Locale.Tr "webauthn_sign_in"}}</p>
 			</div>
-			<div class="ui attached segment gt-df gt-ac gt-jc gt-gap-2 gt-py-3">
+			<div class="ui attached segment tw-flex tw-content-center tw-justify-center gt-gap-2 gt-py-3">
 				<div class="is-loading" style="width: 40px; height: 40px"></div>
 				{{ctx.Locale.Tr "webauthn_press_button"}}
 			</div>
diff --git a/templates/user/dashboard/feeds.tmpl b/templates/user/dashboard/feeds.tmpl
index 0e7371ad83..382b0d4542 100644
--- a/templates/user/dashboard/feeds.tmpl
+++ b/templates/user/dashboard/feeds.tmpl
@@ -84,7 +84,7 @@
 					{{$push := ActionContent2Commits .}}
 					{{$repoLink := (.GetRepoLink ctx)}}
 					{{$repo := .Repo}}
-					<div class="gt-df gt-fc gt-gap-2">
+					<div class="tw-flex tw-flex-col gt-gap-2">
 						{{range $push.Commits}}
 							{{$commitLink := printf "%s/commit/%s" $repoLink .Sha1}}
 							<div class="flex-text-block">
diff --git a/templates/user/dashboard/milestones.tmpl b/templates/user/dashboard/milestones.tmpl
index 214081d423..05f2b30efb 100644
--- a/templates/user/dashboard/milestones.tmpl
+++ b/templates/user/dashboard/milestones.tmpl
@@ -79,7 +79,7 @@
 									{{svg "octicon-milestone" 16}}
 									<a class="muted" href="{{.Repo.Link}}/milestone/{{.ID}}">{{.Name}}</a>
 								</h3>
-								<div class="gt-df gt-ac">
+								<div class="tw-flex tw-content-center">
 									<span class="gt-mr-3">{{.Completeness}}%</span>
 									<progress value="{{.Completeness}}" max="100"></progress>
 								</div>
diff --git a/templates/user/notification/notification_div.tmpl b/templates/user/notification/notification_div.tmpl
index 431aca0975..9da9e16d93 100644
--- a/templates/user/notification/notification_div.tmpl
+++ b/templates/user/notification/notification_div.tmpl
@@ -1,7 +1,7 @@
 <div role="main" aria-label="{{.Title}}" class="page-content user notification" id="notification_div" data-sequence-number="{{.SequenceNumber}}">
 	<div class="ui container">
 		{{$notificationUnreadCount := call .NotificationUnreadCount}}
-		<div class="gt-df gt-ac gt-sb gt-mb-4">
+		<div class="tw-flex tw-content-center tw-justify-between gt-mb-4">
 			<div class="small-menu-items ui compact tiny menu">
 				<a class="{{if eq .Status 1}}active {{end}}item" href="{{AppSubUrl}}/notifications?q=unread">
 					{{ctx.Locale.Tr "notification.unread"}}
@@ -25,7 +25,7 @@
 		<div class="gt-p-0">
 			<div id="notification_table">
 				{{if not .Notifications}}
-					<div class="gt-df gt-ac gt-fc gt-p-4">
+					<div class="tw-flex tw-content-center tw-flex-col gt-p-4">
 						{{svg "octicon-inbox" 56 "gt-mb-4"}}
 						{{if eq .Status 1}}
 							{{ctx.Locale.Tr "notification.no_unread"}}
@@ -35,7 +35,7 @@
 					</div>
 				{{else}}
 					{{range $notification := .Notifications}}
-						<div class="notifications-item gt-df gt-ac gt-fw gt-gap-3 gt-p-3" id="notification_{{.ID}}" data-status="{{.Status}}">
+						<div class="notifications-item tw-flex tw-content-center tw-flex-wrap gt-gap-3 gt-p-3" id="notification_{{.ID}}" data-status="{{.Status}}">
 							<div class="notifications-icon gt-ml-3 gt-mr-2 tw-self-start gt-mt-2">
 								{{if .Issue}}
 									{{template "shared/issueicon" .Issue}}
@@ -43,7 +43,7 @@
 									{{svg "octicon-repo" 16 "text grey"}}
 								{{end}}
 							</div>
-							<a class="notifications-link gt-df gt-f1 gt-fc silenced" href="{{.Link ctx}}">
+							<a class="notifications-link tw-flex tw-flex-1 tw-flex-col silenced" href="{{.Link ctx}}">
 								<div class="notifications-top-row gt-font-13">
 									{{.Repository.FullName}} {{if .Issue}}<span class="text light-3">#{{.Issue.Index}}</span>{{end}}
 									{{if eq .Status 3}}
@@ -60,14 +60,14 @@
 									</span>
 								</div>
 							</a>
-							<div class="notifications-updated gt-ac gt-mr-3">
+							<div class="notifications-updated tw-content-center gt-mr-3">
 								{{if .Issue}}
 									{{TimeSinceUnix .Issue.UpdatedUnix ctx.Locale}}
 								{{else}}
 									{{TimeSinceUnix .UpdatedUnix ctx.Locale}}
 								{{end}}
 							</div>
-							<div class="notifications-buttons gt-ac gt-je gt-gap-2 gt-px-2">
+							<div class="notifications-buttons tw-content-center tw-justify-end gt-gap-2 gt-px-2">
 								{{if ne .Status 3}}
 									<form action="{{AppSubUrl}}/notifications/status" method="post">
 										{{$.CsrfTokenHtml}}
diff --git a/templates/user/notification/notification_subscriptions.tmpl b/templates/user/notification/notification_subscriptions.tmpl
index d39e628263..eb71621d92 100644
--- a/templates/user/notification/notification_subscriptions.tmpl
+++ b/templates/user/notification/notification_subscriptions.tmpl
@@ -11,8 +11,8 @@
 		</div>
 		<div class="ui bottom attached active tab segment">
 			{{if eq .Status 1}}
-				<div class="gt-df gt-sb">
-					<div class="gt-df">
+				<div class="tw-flex tw-justify-between">
+					<div class="tw-flex">
 						<div class="small-menu-items ui compact tiny menu">
 							<a class="{{if eq .State "all"}}active {{end}}item" href="?sort={{$.SortType}}&state=all&issueType={{$.IssueType}}&labels={{$.Labels}}">
 								{{ctx.Locale.Tr "all"}}
@@ -27,7 +27,7 @@
 							</a>
 						</div>
 					</div>
-					<div class="gt-df gt-sb">
+					<div class="tw-flex tw-justify-between">
 						<div class="ui right aligned secondary filter menu labels">
 							<!-- Type -->
 								<div class="ui dropdown type jump item">
diff --git a/templates/user/settings/account.tmpl b/templates/user/settings/account.tmpl
index 515e79d739..efc09156e6 100644
--- a/templates/user/settings/account.tmpl
+++ b/templates/user/settings/account.tmpl
@@ -46,7 +46,7 @@
 					<form action="{{AppSubUrl}}/user/settings/account/email" class="ui form" method="post">
 						{{$.CsrfTokenHtml}}
 						<input name="_method" type="hidden" value="NOTIFICATION">
-						<div class="gt-df gt-fw gt-gap-3">
+						<div class="tw-flex tw-flex-wrap gt-gap-3">
 							<div class="ui selection dropdown">
 								<input name="preference" type="hidden" value="{{.EmailNotificationsPreference}}">
 								{{svg "octicon-triangle-down" 14 "dropdown icon"}}
diff --git a/templates/user/settings/applications_oauth2_list.tmpl b/templates/user/settings/applications_oauth2_list.tmpl
index bf6b28ec5f..1125a66d47 100644
--- a/templates/user/settings/applications_oauth2_list.tmpl
+++ b/templates/user/settings/applications_oauth2_list.tmpl
@@ -4,7 +4,7 @@
 			{{ctx.Locale.Tr "settings.oauth2_application_create_description"}}
 		</div>
 		{{range .Applications}}
-			<div class="flex-item gt-ac">
+			<div class="flex-item tw-content-center">
 				<div class="flex-item-leading">
 					{{svg "octicon-apps" 32}}
 				</div>
diff --git a/templates/user/settings/repos.tmpl b/templates/user/settings/repos.tmpl
index eeb2b6cbdd..41cdae2968 100644
--- a/templates/user/settings/repos.tmpl
+++ b/templates/user/settings/repos.tmpl
@@ -30,8 +30,8 @@
 											<span><a href="{{$repo.BaseRepo.Link}}">{{$repo.BaseRepo.OwnerName}}/{{$repo.BaseRepo.Name}}</a></span>
 										{{end}}
 									{{else}}
-										<span class="icon gt-dib gt-pt-3">{{svg "octicon-file-directory-fill"}}</span>
-										<span class="name gt-dib gt-pt-3">{{$.ContextUser.Name}}/{{$dir}}</span>
+										<span class="icon tw-inline-block gt-pt-3">{{svg "octicon-file-directory-fill"}}</span>
+										<span class="name tw-inline-block gt-pt-3">{{$.ContextUser.Name}}/{{$dir}}</span>
 										<div class="tw-float-right">
 											{{if $.allowAdopt}}
 												<button class="ui button primary show-modal gt-p-3" data-modal="#adopt-unadopted-modal-{{$dirI}}"><span class="icon">{{svg "octicon-plus"}}</span><span class="label">{{ctx.Locale.Tr "repo.adopt_preexisting_label"}}</span></button>
diff --git a/templates/user/settings/security/openid.tmpl b/templates/user/settings/security/openid.tmpl
index 0e9b4adcbe..63bc56ba9b 100644
--- a/templates/user/settings/security/openid.tmpl
+++ b/templates/user/settings/security/openid.tmpl
@@ -7,7 +7,7 @@
 			{{ctx.Locale.Tr "settings.openid_desc"}}
 		</div>
 		{{range .OpenIDs}}
-			<div class="flex-item gt-ac">
+			<div class="flex-item tw-content-center">
 				<div class="flex-item-leading">
 					{{svg "fontawesome-openid" 20}}
 				</div>
diff --git a/templates/webhook/new.tmpl b/templates/webhook/new.tmpl
index 305133c03a..e0d04c1767 100644
--- a/templates/webhook/new.tmpl
+++ b/templates/webhook/new.tmpl
@@ -1,7 +1,7 @@
 <h4 class="ui top attached header">
 	{{.CustomHeaderTitle}}
 	<div class="ui right type dropdown">
-		<div class="text gt-df gt-ac">
+		<div class="text tw-flex tw-content-center">
 			{{template "shared/webhook/icon" (dict "Size" 20 "HookType" .ctxData.HookType)}}
 			{{ctx.Locale.Tr (print "repo.settings.web_hook_name_" .ctxData.HookType)}}
 		</div>
diff --git a/tests/integration/release_test.go b/tests/integration/release_test.go
index 04de0c123f..b5af43e492 100644
--- a/tests/integration/release_test.go
+++ b/tests/integration/release_test.go
@@ -234,7 +234,7 @@ func TestViewTagsList(t *testing.T) {
 
 	tagNames := make([]string, 0, 5)
 	tags.Each(func(i int, s *goquery.Selection) {
-		tagNames = append(tagNames, s.Find(".tag a.gt-df.gt-ac").Text())
+		tagNames = append(tagNames, s.Find(".tag a.tw-flex.tw-content-center").Text())
 	})
 
 	assert.EqualValues(t, []string{"v1.0", "delete-tag", "v1.1"}, tagNames)
diff --git a/web_src/css/actions.css b/web_src/css/actions.css
index e353a013a7..e7b9a3855a 100644
--- a/web_src/css/actions.css
+++ b/web_src/css/actions.css
@@ -14,10 +14,6 @@
   color: var(--color-red-light);
 }
 
-.runner-container .runner-basic-info .gt-dib {
-  margin-right: 1em;
-}
-
 .runner-container .runner-new-text {
   color: var(--color-white);
 }
diff --git a/web_src/css/helpers.css b/web_src/css/helpers.css
index a3817be223..c7097e631b 100644
--- a/web_src/css/helpers.css
+++ b/web_src/css/helpers.css
@@ -2,16 +2,6 @@
 Gitea's tailwind-style CSS helper classes have `gt-` prefix.
 Gitea's private styles use `g-` prefix.
 */
-.gt-df { display: flex !important; }
-.gt-dib { display: inline-block !important; }
-.gt-ac { align-items: center !important; }
-.gt-jc { justify-content: center !important; }
-.gt-je { justify-content: flex-end !important; }
-.gt-sb { justify-content: space-between !important; }
-.gt-fc { flex-direction: column !important; }
-.gt-f1 { flex: 1 !important; }
-.gt-fw { flex-wrap: wrap !important; }
-.gt-vm { vertical-align: middle !important; }
 
 .gt-mono {
   font-family: var(--fonts-monospace) !important;
diff --git a/web_src/js/components/ActionRunStatus.vue b/web_src/js/components/ActionRunStatus.vue
index 51a7745431..08a47eded7 100644
--- a/web_src/js/components/ActionRunStatus.vue
+++ b/web_src/js/components/ActionRunStatus.vue
@@ -28,7 +28,7 @@ export default {
 };
 </script>
 <template>
-  <span class="gt-df gt-ac" :data-tooltip-content="localeStatus" v-if="status">
+  <span class="tw-flex tw-content-center" :data-tooltip-content="localeStatus" v-if="status">
     <SvgIcon name="octicon-check-circle-fill" class="text green" :size="size" :class-name="className" v-if="status === 'success'"/>
     <SvgIcon name="octicon-skip" class="text grey" :size="size" :class-name="className" v-else-if="status === 'skipped'"/>
     <SvgIcon name="octicon-clock" class="text yellow" :size="size" :class-name="className" v-else-if="status === 'waiting'"/>
diff --git a/web_src/js/components/DashboardRepoList.vue b/web_src/js/components/DashboardRepoList.vue
index 177ae04855..df46516449 100644
--- a/web_src/js/components/DashboardRepoList.vue
+++ b/web_src/js/components/DashboardRepoList.vue
@@ -345,12 +345,12 @@ export default sfc; // activate the IDE's Vue plugin
       <a :class="{item: true, active: tab === 'organizations'}" @click="changeTab('organizations')">{{ textOrganization }}</a>
     </div>
     <div v-show="tab === 'repos'" class="ui tab active list dashboard-repos">
-      <h4 class="ui top attached header gt-df gt-ac">
-        <div class="gt-f1 gt-df gt-ac">
+      <h4 class="ui top attached header tw-flex tw-content-center">
+        <div class="tw-flex-1 tw-flex tw-content-center">
           {{ textMyRepos }}
           <span class="ui grey label gt-ml-3">{{ reposTotalCount }}</span>
         </div>
-        <a class="gt-df gt-ac muted" :href="subUrl + '/repo/create' + (isOrganization ? '?org=' + organizationId : '')" :data-tooltip-content="textNewRepo">
+        <a class="tw-flex tw-content-center muted" :href="subUrl + '/repo/create' + (isOrganization ? '?org=' + organizationId : '')" :data-tooltip-content="textNewRepo">
           <svg-icon name="octicon-plus"/>
         </a>
       </h4>
@@ -411,7 +411,7 @@ export default sfc; // activate the IDE's Vue plugin
       </div>
       <div v-if="repos.length" class="ui attached table segment tw-rounded-b">
         <ul class="repo-owner-name-list">
-          <li class="gt-df gt-ac gt-py-3" v-for="repo, index in repos" :class="{'active': index === activeIndex}" :key="repo.id">
+          <li class="tw-flex tw-content-center gt-py-3" v-for="repo, index in repos" :class="{'active': index === activeIndex}" :key="repo.id">
             <a class="repo-list-link muted" :href="repo.link">
               <svg-icon :name="repoIcon(repo)" :size="16" class-name="repo-list-icon"/>
               <div class="text truncate">{{ repo.full_name }}</div>
@@ -419,7 +419,7 @@ export default sfc; // activate the IDE's Vue plugin
                 <svg-icon name="octicon-archive" :size="16"/>
               </div>
             </a>
-            <a class="gt-df gt-ac" v-if="repo.latest_commit_status_state" :href="repo.latest_commit_status_state_link" :data-tooltip-content="repo.locale_latest_commit_status_state">
+            <a class="tw-flex tw-content-center" v-if="repo.latest_commit_status_state" :href="repo.latest_commit_status_state_link" :data-tooltip-content="repo.locale_latest_commit_status_state">
               <!-- the commit status icon logic is taken from templates/repo/commit_status.tmpl -->
               <svg-icon :name="statusIcon(repo.latest_commit_status_state)" :class-name="'gt-ml-3 commit-status icon text ' + statusColor(repo.latest_commit_status_state)" :size="16"/>
             </a>
@@ -458,18 +458,18 @@ export default sfc; // activate the IDE's Vue plugin
       </div>
     </div>
     <div v-if="!isOrganization" v-show="tab === 'organizations'" class="ui tab active list dashboard-orgs">
-      <h4 class="ui top attached header gt-df gt-ac">
-        <div class="gt-f1 gt-df gt-ac">
+      <h4 class="ui top attached header tw-flex tw-content-center">
+        <div class="tw-flex-1 tw-flex tw-content-center">
           {{ textMyOrgs }}
           <span class="ui grey label gt-ml-3">{{ organizationsTotalCount }}</span>
         </div>
-        <a class="gt-df gt-ac muted" v-if="canCreateOrganization" :href="subUrl + '/org/create'" :data-tooltip-content="textNewOrg">
+        <a class="tw-flex tw-content-center muted" v-if="canCreateOrganization" :href="subUrl + '/org/create'" :data-tooltip-content="textNewOrg">
           <svg-icon name="octicon-plus"/>
         </a>
       </h4>
       <div v-if="organizations.length" class="ui attached table segment tw-rounded-b">
         <ul class="repo-owner-name-list">
-          <li class="gt-df gt-ac gt-py-3" v-for="org in organizations" :key="org.name">
+          <li class="tw-flex tw-content-center gt-py-3" v-for="org in organizations" :key="org.name">
             <a class="repo-list-link muted" :href="subUrl + '/' + encodeURIComponent(org.name)">
               <svg-icon name="octicon-organization" :size="16" class-name="repo-list-icon"/>
               <div class="text truncate">{{ org.name }}</div>
@@ -479,7 +479,7 @@ export default sfc; // activate the IDE's Vue plugin
                 </span>
               </div>
             </a>
-            <div class="text light grey gt-df gt-ac gt-ml-3">
+            <div class="text light grey tw-flex tw-content-center gt-ml-3">
               {{ org.num_repos }}
               <svg-icon name="octicon-repo" :size="16" class-name="gt-ml-2 gt-mt-1"/>
             </div>
diff --git a/web_src/js/components/DiffCommitSelector.vue b/web_src/js/components/DiffCommitSelector.vue
index b465127aca..e8ceffa3e8 100644
--- a/web_src/js/components/DiffCommitSelector.vue
+++ b/web_src/js/components/DiffCommitSelector.vue
@@ -240,7 +240,7 @@ export default {
           @click.meta.exact="commitClicked(commit.id, true)"
           @click.shift.exact.stop.prevent="commitClickedShift(commit)"
         >
-          <div class="gt-f1 gt-df gt-fc gt-gap-2">
+          <div class="tw-flex-1 tw-flex tw-flex-col gt-gap-2">
             <div class="gt-ellipsis commit-list-summary">
               {{ commit.summary }}
             </div>
diff --git a/web_src/js/components/DiffFileList.vue b/web_src/js/components/DiffFileList.vue
index 8bde61804f..2499d998a8 100644
--- a/web_src/js/components/DiffFileList.vue
+++ b/web_src/js/components/DiffFileList.vue
@@ -38,7 +38,7 @@ export default {
 <template>
   <ol class="diff-stats gt-m-0" ref="root" v-if="store.fileListIsVisible">
     <li v-for="file in store.files" :key="file.NameHash">
-      <div class="gt-font-semibold gt-df gt-ac pull-right">
+      <div class="gt-font-semibold tw-flex tw-content-center pull-right">
         <span v-if="file.IsBin" class="gt-ml-1 gt-mr-3">{{ store.binaryFileMessage }}</span>
         {{ file.IsBin ? '' : file.Addition + file.Deletion }}
         <span v-if="!file.IsBin" class="diff-stats-bar gt-mx-3" :data-tooltip-content="store.statisticsMessage.replace('%d', (file.Addition + file.Deletion)).replace('%d', file.Addition).replace('%d', file.Deletion)">
@@ -50,7 +50,7 @@ export default {
       <a class="file gt-mono" :href="'#diff-' + file.NameHash">{{ file.Name }}</a>
     </li>
     <li v-if="store.isIncomplete" class="gt-pt-2">
-      <span class="file gt-df gt-ac gt-sb">{{ store.tooManyFilesMessage }}
+      <span class="file tw-flex tw-content-center tw-justify-between">{{ store.tooManyFilesMessage }}
         <a :class="['ui', 'basic', 'tiny', 'button', store.isLoadingNewData ? 'disabled' : '']" @click.stop="loadMoreData">{{ store.showMoreMessage }}</a>
       </span>
     </li>
diff --git a/web_src/js/components/DiffFileTreeItem.vue b/web_src/js/components/DiffFileTreeItem.vue
index 9d7ab4afc5..a5d78f07f1 100644
--- a/web_src/js/components/DiffFileTreeItem.vue
+++ b/web_src/js/components/DiffFileTreeItem.vue
@@ -37,7 +37,7 @@ export default {
   >
     <!-- file -->
     <SvgIcon name="octicon-file"/>
-    <span class="gt-ellipsis gt-f1">{{ item.name }}</span>
+    <span class="gt-ellipsis tw-flex-1">{{ item.name }}</span>
     <SvgIcon :name="getIconForDiffType(item.file.Type).name" :class="getIconForDiffType(item.file.Type).classes"/>
   </a>
   <div v-else class="item-directory" :title="item.name" @click.stop="collapsed = !collapsed">
diff --git a/web_src/js/components/PullRequestMergeForm.vue b/web_src/js/components/PullRequestMergeForm.vue
index 170d0d85c6..5f2e19f2e5 100644
--- a/web_src/js/components/PullRequestMergeForm.vue
+++ b/web_src/js/components/PullRequestMergeForm.vue
@@ -136,7 +136,7 @@ export default {
       </div>
     </form>
 
-    <div v-if="!showActionForm" class="gt-df">
+    <div v-if="!showActionForm" class="tw-flex">
       <!-- the merge button -->
       <div class="ui buttons merge-button" :class="[mergeForm.emptyCommit ? 'grey' : mergeForm.allOverridableChecksOk ? 'primary' : 'red']" @click="toggleActionForm(true)">
         <button class="ui button">
diff --git a/web_src/js/components/RepoBranchTagSelector.vue b/web_src/js/components/RepoBranchTagSelector.vue
index 83289c8852..a5ac689e5a 100644
--- a/web_src/js/components/RepoBranchTagSelector.vue
+++ b/web_src/js/components/RepoBranchTagSelector.vue
@@ -245,8 +245,8 @@ export default sfc; // activate IDE's Vue plugin
 </script>
 <template>
   <div class="ui dropdown custom">
-    <button class="branch-dropdown-button gt-ellipsis ui basic small compact button gt-df gt-m-0" @click="menuVisible = !menuVisible" @keyup.enter="menuVisible = !menuVisible">
-      <span class="text gt-df gt-ac gt-mr-2">
+    <button class="branch-dropdown-button gt-ellipsis ui basic small compact button tw-flex gt-m-0" @click="menuVisible = !menuVisible" @keyup.enter="menuVisible = !menuVisible">
+      <span class="text tw-flex tw-content-center gt-mr-2">
         <template v-if="release">{{ textReleaseCompare }}</template>
         <template v-else>
           <svg-icon v-if="isViewTag" name="octicon-tag"/>
diff --git a/web_src/js/components/RepoCodeFrequency.vue b/web_src/js/components/RepoCodeFrequency.vue
index c55bbff9cd..305732afc1 100644
--- a/web_src/js/components/RepoCodeFrequency.vue
+++ b/web_src/js/components/RepoCodeFrequency.vue
@@ -144,10 +144,10 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header gt-df gt-ac gt-sb">
+    <div class="ui header tw-flex tw-content-center tw-justify-between">
       {{ isLoading ? locale.loadingTitle : errorText ? locale.loadingTitleFailed: `Code frequency over the history of ${repoLink.slice(1)}` }}
     </div>
-    <div class="gt-df ui segment main-graph">
+    <div class="tw-flex ui segment main-graph">
       <div v-if="isLoading || errorText !== ''" class="gt-tc tw-m-auto">
         <div v-if="isLoading">
           <SvgIcon name="octicon-sync" class="gt-mr-3 job-status-rotate"/>
diff --git a/web_src/js/components/RepoContributors.vue b/web_src/js/components/RepoContributors.vue
index 6093c762cb..ca51ca8aba 100644
--- a/web_src/js/components/RepoContributors.vue
+++ b/web_src/js/components/RepoContributors.vue
@@ -303,7 +303,7 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header gt-df gt-ac gt-sb">
+    <div class="ui header tw-flex tw-content-center tw-justify-between">
       <div>
         <relative-time
           v-if="xAxisMin > 0"
@@ -352,7 +352,7 @@ export default {
         </div>
       </div>
     </div>
-    <div class="gt-df ui segment main-graph">
+    <div class="tw-flex ui segment main-graph">
       <div v-if="isLoading || errorText !== ''" class="gt-tc tw-m-auto">
         <div v-if="isLoading">
           <SvgIcon name="octicon-sync" class="gt-mr-3 job-status-rotate"/>
@@ -374,17 +374,17 @@ export default {
         :key="index"
         v-memo="[sortedContributors, type]"
       >
-        <div class="ui top attached header gt-df gt-f1">
+        <div class="ui top attached header tw-flex tw-flex-1">
           <b class="ui right">#{{ index + 1 }}</b>
           <a :href="contributor.home_link">
-            <img class="ui avatar gt-vm" height="40" width="40" :src="contributor.avatar_link">
+            <img class="ui avatar tw-align-middle" height="40" width="40" :src="contributor.avatar_link">
           </a>
           <div class="gt-ml-3">
             <a v-if="contributor.home_link !== ''" :href="contributor.home_link"><h4>{{ contributor.name }}</h4></a>
             <h4 v-else class="contributor-name">
               {{ contributor.name }}
             </h4>
-            <p class="gt-font-12 gt-df gt-gap-2">
+            <p class="gt-font-12 tw-flex gt-gap-2">
               <strong v-if="contributor.total_commits">{{ contributor.total_commits.toLocaleString() }} {{ locale.contributionType.commits }}</strong>
               <strong v-if="contributor.total_additions" class="text green">{{ contributor.total_additions.toLocaleString() }}++ </strong>
               <strong v-if="contributor.total_deletions" class="text red">
diff --git a/web_src/js/components/RepoRecentCommits.vue b/web_src/js/components/RepoRecentCommits.vue
index c1fd40f506..23738b8060 100644
--- a/web_src/js/components/RepoRecentCommits.vue
+++ b/web_src/js/components/RepoRecentCommits.vue
@@ -121,10 +121,10 @@ export default {
 </script>
 <template>
   <div>
-    <div class="ui header gt-df gt-ac gt-sb">
+    <div class="ui header tw-flex tw-content-center tw-justify-between">
       {{ isLoading ? locale.loadingTitle : errorText ? locale.loadingTitleFailed: "Number of commits in the past year" }}
     </div>
-    <div class="gt-df ui segment main-graph">
+    <div class="tw-flex ui segment main-graph">
       <div v-if="isLoading || errorText !== ''" class="gt-tc tw-m-auto">
         <div v-if="isLoading">
           <SvgIcon name="octicon-sync" class="gt-mr-3 job-status-rotate"/>
diff --git a/web_src/js/features/repo-issue-content.js b/web_src/js/features/repo-issue-content.js
index 9e2b773730..f67a22ea6f 100644
--- a/web_src/js/features/repo-issue-content.js
+++ b/web_src/js/features/repo-issue-content.js
@@ -16,7 +16,7 @@ function showContentHistoryDetail(issueBaseUrl, commentId, historyId, itemTitleH
   $dialog = $(`
 <div class="ui modal content-history-detail-dialog">
   ${svg('octicon-x', 16, 'close icon inside')}
-  <div class="header gt-df gt-ac gt-sb">
+  <div class="header tw-flex tw-content-center tw-justify-between">
     <div>${itemTitleHtml}</div>
     <div class="ui dropdown dialog-header-options gt-mr-5 gt-hidden">
       ${i18nTextOptions}
diff --git a/web_src/js/features/repo-issue-list.js b/web_src/js/features/repo-issue-list.js
index 48658fd723..4bdd5e5a8e 100644
--- a/web_src/js/features/repo-issue-list.js
+++ b/web_src/js/features/repo-issue-list.js
@@ -108,7 +108,7 @@ function initRepoIssueListAuthorDropdown() {
         // the content is provided by backend IssuePosters handler
         const processedResults = []; // to be used by dropdown to generate menu items
         for (const item of resp.results) {
-          let html = `<img class="ui avatar gt-vm" src="${htmlEscape(item.avatar_link)}" aria-hidden="true" alt="" width="20" height="20"><span class="gt-ellipsis">${htmlEscape(item.username)}</span>`;
+          let html = `<img class="ui avatar tw-align-middle" src="${htmlEscape(item.avatar_link)}" aria-hidden="true" alt="" width="20" height="20"><span class="gt-ellipsis">${htmlEscape(item.username)}</span>`;
           if (item.full_name) html += `<span class="search-fullname gt-ml-3">${htmlEscape(item.full_name)}</span>`;
           processedResults.push({value: item.user_id, name: html});
         }