Merge branch '3974-fix-codeclimate-margins' into 'master'

Fix margins in code quality widget

Closes #3974

See merge request gitlab-org/gitlab-ee!3338

app/assets/stylesheets/pages/merge_requests.scss

@@ -781,10 +781,9 @@
 
   .code-quality-container {
     border-top: 1px solid $gray-darker;
-    border-bottom: 1px solid $gray-darker;
     padding: $gl-padding-top;
     background-color: $gray-light;
-    margin: 4px -16px 0;
+    margin: $gl-padding -16px -16px;
 
     .mr-widget-code-quality-list {
       list-style: none;