Fix UI on mobile view (#25315)

Various fixes to pages or elements which were looking ugly on mobile.
<details>
<summary>Screenshots</summary>

![Bildschirmfoto vom 2023-06-17
20-38-41](https://github.com/go-gitea/gitea/assets/47871822/30b5d3ce-df3b-43eb-a4c2-c3790667fb9d)
![Bildschirmfoto vom 2023-06-17
20-39-27](https://github.com/go-gitea/gitea/assets/47871822/27c07b25-3602-4fb2-b34d-d5e875e054e9)
![Bildschirmfoto vom 2023-06-17
20-41-27](https://github.com/go-gitea/gitea/assets/47871822/dacdbb4e-e3dd-4b94-abf0-c68e3d64bd3b)
![Bildschirmfoto vom 2023-06-17
20-41-48](https://github.com/go-gitea/gitea/assets/47871822/72432c35-7c4a-4c7f-a767-3562f26a5c14)
![Bildschirmfoto vom 2023-06-17
20-42-37](https://github.com/go-gitea/gitea/assets/47871822/737c26ed-1910-4467-98ef-e8769bbbe6f0)
![Bildschirmfoto vom 2023-06-17
20-42-52](https://github.com/go-gitea/gitea/assets/47871822/1813b4bc-43c0-4912-8acb-5d799c090bf3)
![Bildschirmfoto vom 2023-06-17
20-43-06](https://github.com/go-gitea/gitea/assets/47871822/136466e8-34e5-419d-97ec-5202ff819fd2)
![Bildschirmfoto vom 2023-06-17
20-43-42](https://github.com/go-gitea/gitea/assets/47871822/59270bb2-d661-4a84-8504-3e50f771f767)
![Bildschirmfoto vom 2023-06-17
20-44-44](https://github.com/go-gitea/gitea/assets/47871822/494e274d-3771-4141-9419-0a4bbd8b7f64)

</details>

Co-authored by @silverwind

---------

Co-authored-by: silverwind <me@silverwind.io>

1 files changed, 1 insertions, 0 deletions

diff --git a/web_src/css/index.css b/web_src/css/index.css
index c9cc1d8032..125249ceab 100644
--- a/web_src/css/index.css
+++ b/web_src/css/index.css
@@ -9,6 +9,7 @@
 @import "./modules/comment.css";
 
 @import "./shared/issuelist.css";
+@import "./shared/milestone.css";
 @import "./shared/repoorg.css";
 @import "./shared/settings.css";