Makes `@mentions links` have a different styling for better separation

app/assets/stylesheets/framework/common.scss

@@ -130,11 +130,6 @@ span.update-author {
   }
 }
-.user-mention {
-  color: $user-mention-color;
-  font-weight: $gl-font-weight-bold;
-}
-
 .field_with_errors {
   display: inline;
 }

app/assets/stylesheets/framework/gfm.scss

@@ -6,3 +6,14 @@
 .gfm-commit_range {
   @extend .commit-sha;
 }
+
+.gfm-project_member {
+  padding: 0 2px;
+  border-radius: #{$border-radius-default / 2};
+  background-color: $user-mention-bg;
+
+  &:hover {
+    background-color: $user-mention-bg-hover;
+    text-decoration: none;
+  }
+}

app/assets/stylesheets/framework/variables.scss

@@ -262,7 +262,8 @@ $well-pre-bg: #eee;
 $well-pre-color: #555;
 $loading-color: #555;
 $update-author-color: #999;
-$user-mention-color: #2fa0bb;
+$user-mention-bg: rgba($blue-500, 0.044);
+$user-mention-bg-hover: rgba($blue-500, 0.15);
 $time-color: #999;
 $project-member-show-color: #aaa;
 $gl-promo-color: #aaa;

changelogs/unreleased/mentions-in-comments.yml

+---
+title: Makes @mentions links have a different styling for better separation
+merge_request:
+author:
+type: added