Ticket #35130: 35130.diff

src/wp-admin/css/themes.css

@@ -1634 +1634 @@
         position: relative;
         z-index: 0;
         background-color: #fff;
+        -webkit-overflow-scrolling: touch;
+        overflow-y: scroll;
 }
 
 .theme-install-overlay .wp-full-overlay-main:before {