Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 24773)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -3760,10 +3760,10 @@
 
 .revisions-tooltip {
 	position: absolute;
-	bottom: 106px;
+	bottom: 105px;
 	margin-right: 0;
 	margin-left: -69px;
-	z-index: 1;
+	z-index: 0;
 	max-width: 350px;
 	min-width: 130px;
 	padding: 8px 4px;