Index: wp-admin/css/colors-classic.dev.css
===================================================================
--- wp-admin/css/colors-classic.dev.css	(revision 18275)
+++ wp-admin/css/colors-classic.dev.css	(working copy)
@@ -708,6 +708,7 @@
 
 #dashboard_browser_nag.postbox {
 	background-color: #e29808;
+	background-image: none;
 	border-color: #EDC048;
 }
 
@@ -727,7 +728,7 @@
 	-moz-box-shadow: none;
 	-webkit-box-shadow: none;
 	box-shadow: none;
-	background-image: none;
+	background: transparent none;
 }
 
 .ui-sortable #dashboard_browser_nag.postbox,
Index: wp-admin/css/colors-fresh.dev.css
===================================================================
--- wp-admin/css/colors-fresh.dev.css	(revision 18275)
+++ wp-admin/css/colors-fresh.dev.css	(working copy)
@@ -714,6 +714,7 @@
 
 #dashboard_browser_nag.postbox {
 	background-color: #e29808;
+	background-image: none;
 	border-color: #EDC048;
 }
 
@@ -733,7 +734,7 @@
 	-moz-box-shadow: none;
 	-webkit-box-shadow: none;
 	box-shadow: none;
-	background-image: none;
+	background: transparent none;
 }
 
 .ui-sortable #dashboard_browser_nag.postbox,