fix(toolbox): Fix overflow menu & button background

css/_atlaskit_overrides.scss

  * Keep overflow menu within screen vertical bounds and make it scrollable.
  */
  .toolbox-button-wth-dialog > div:nth-child(2) {
+    background: $menuBG;
     max-height: calc(100vh - #{$newToolbarSizeWithPadding} - 46px);
     margin-bottom: 4px;
+    padding: 0;
     overflow-y: auto;
 }
 

css/_toolbars.scss

 
     .toolbox-button-wth-dialog {
         display: inline-block;
-
-        &> div {
-            padding: 0;
-            background: $menuBG;
-        }
     }
 }