Fix MR widget border

app/assets/stylesheets/pages/merge_requests.scss

@@ -116,10 +116,8 @@
 
       .modify-merge-commit-link {
         padding: 0;
-
         background-color: transparent;
         border: 0;
-
         color: $gl-text-color;
 
         &:hover,
@@ -501,10 +499,6 @@
   }
 }
 
-.merge-request-details .content-block {
-  border-bottom: 0;
-}
-
 .mr-source-target {
   display: flex;
   flex-wrap: wrap;

app/views/projects/merge_requests/_mr_box.html.haml

-.detail-page-description.content-block
+.detail-page-description
   %h2.title
     = markdown_field(@merge_request, :title)