Ticket #41155: 41155.1.patch

src/wp-admin/css/themes.css

@@ -370 +370 @@
         bottom: 0;
         background: #f1f1f1;
         background: rgba( 238, 238, 238, 0.9 );
-        z-index: 10000; /* Over WP Pointers. */
+        z-index: 9989; /* Over WP Pointers. */
 }
 
 .theme-overlay .theme-header {
@@ -481 +481 @@
         background: #fff;
         -webkit-box-shadow: 0 1px 20px 5px rgba(0, 0, 0, 0.1);
         box-shadow: 0 1px 20px 5px rgba(0, 0, 0, 0.1);
-        z-index: 10000; /* Over WP Pointers. */
+        z-index: 9990; /* Over WP Pointers. */
         -webkit-box-sizing: border-box;
         -moz-box-sizing: border-box;
         box-sizing: border-box;
@@ -801 +801 @@
 
 @media only screen and (min-width: 1680px) {
         .theme-overlay .theme-wrap {
-                width: 1450px;
+                width: 1435px; /* Reduced theme overlay width for admin sidebar submenu */
                 margin: 0 auto;
         }
 }