Merge branch '10603-markdown-css' into 'master'

Removes EE differences for markdown_area.scss

Closes gitlab-ee#10603

See merge request gitlab-org/gitlab-ce!26489

app/assets/stylesheets/framework/markdown_area.scss

@@ -61,6 +61,10 @@
       padding-top: 0;
       line-height: 19px;
 
+      &.btn.btn-sm {
+        padding: 2px 5px;
+      }
+
       &:focus {
         margin-top: -10px;
         padding-top: 10px;