Index: wp-content/themes/twentyeleven/style.css
===================================================================
--- wp-content/themes/twentyeleven/style.css	(revision 20500)
+++ wp-content/themes/twentyeleven/style.css	(working copy)
@@ -1187,6 +1187,7 @@
 	float: left;
 	display: block;
 	margin: .375em 1.625em 0 0;
+	max-width: 100%;
 }