1 files changed, 23 insertions, 2 deletions
diff --git a/public/less/_base.less b/public/less/_base.less
index 2fdcc18692..5f22bc3236 100644
--- a/public/less/_base.less
+++ b/public/less/_base.less
@@ -1,6 +1,6 @@
- @footer-margin: 40px;
+@footer-margin: 40px;
  
- body {
+body {
 	font-family: 'Helvetica Neue',Arial,Helvetica,sans-serif,'微软雅黑';
 	background-color: #FFFFFF;
 }
@@ -69,4 +69,25 @@ footer {
     height: (2px * @i);
   }
   .generate-img(@n, (@i + 1));
+}
+
+// Accessibility
+.sr-only {
+  position: absolute;
+  width: 1px;
+  height: 1px;
+  padding: 0;
+  margin: -1px;
+  overflow: hidden;
+  clip: rect(0, 0, 0, 0);
+  border: 0;
+}
+.sr-only-focusable:active,
+.sr-only-focusable:focus {
+  position: static;
+  width: auto;
+  height: auto;
+  margin: 0;
+  overflow: visible;
+  clip: auto;
 }
 \ No newline at end of file