Ticket #21021: 21021-2.patch

wp-admin/css/wp-admin.dev.css

@@ -1968 +1968 @@
         box-sizing: border-box;
 }
 
-.postbox-container .meta-box-sortables:empty {
-        min-height: 0;
-        height: 0;
-}
-
-.metabox-holder .postbox-container .empty-container,
-#post-body.columns-2 #side-sortables:empty {
+.metabox-holder .postbox-container .empty-container {
         border: 3px dashed #CCCCCC;
         height: 250px;
 }