fix style issue for new snippet button - fixes issue #19641

add fix to changelog

CHANGELOG

@@ -60,6 +60,7 @@ v 8.10.0 (unreleased)
   - Fix 404 redirect after validation fails importing a GitLab project
   - Added setting to set new users by default as external !4545 (Dravere)
   - Add min value for project limit field on user's form !3622 (jastkand)
+  - Fix new snippet style bug
 
 v 8.9.5
   - Add more debug info to import/export and memory killer. !5108

app/assets/stylesheets/framework/blocks.scss

@@ -223,7 +223,9 @@
 .nav-block {
   .controls {
     float: right;
-    margin-top: 11px;
+    margin-top: 8px;
+    padding-bottom: 7px;
+    border-bottom: 1px solid $white-dark;
   }
 }