Index: src/wp-admin/css/themes.css
===================================================================
--- src/wp-admin/css/themes.css	(revision 33610)
+++ src/wp-admin/css/themes.css	(working copy)
@@ -1664,7 +1664,7 @@
 	float: left;
 	color: #777;
 	line-height: 20px;
-	max-width: 100%;
+	width: 100%;
 }
 
 .theme-install-overlay .wp-full-overlay-header .theme-install {