Ticket #31381: 31381.diff

src/wp-admin/css/themes.css

@@ -924 +924 @@
                 left: 0;
                 padding: 70px 20px 20px;
                 border: none;
-                z-index: 500; /* should overlap #wpadminbar, which is 500 on mobile. */
+                z-index: 100000; /* should overlap #wpadminbar. */
                 position: fixed;
         }