diff --git a/src/wp-admin/css/about.css b/src/wp-admin/css/about.css
index f466fd2240..af8235fc9a 100644
--- a/src/wp-admin/css/about.css
+++ b/src/wp-admin/css/about.css
@@ -145,6 +145,7 @@
 	display: inline-block;
 	float: none;
 	margin-right: 4.799999999%;
+	width: -webkit-calc( 47.6% - 4px );
 	width: calc( 47.6% - 4px );
 	vertical-align: middle;
 }