Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 22147)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -1122,7 +1122,6 @@
 	margin: 0;
 	padding: 8px 20px 12px;
 	position: relative;
-	overflow: auto;
 }
 
 #screen-meta .screen-reader-text {
@@ -1133,6 +1132,10 @@
 	margin: 0 24px 0 0;
 }
 
+::-webkit-validation-bubble-message {
+    z-index:9999 !important;
+}
+
 /* screen options and help tabs revert */
 #screen-meta {
 	display: none;