Index: wp-admin/css/wp-admin.css
===================================================================
--- wp-admin/css/wp-admin.css	(revision 27007)
+++ wp-admin/css/wp-admin.css	(working copy)
@@ -3303,7 +3303,7 @@
 	background: none;
 }
 
-#activity-widget #the-comment-list .comment {
+#activity-widget #the-comment-list .comment-item {
 	background: #fafafa;
 	padding: 12px;
 	position: relative;