diff --git a/src/wp-admin/css/themes.css b/src/wp-admin/css/themes.css
index 4df1e9b2df..2f132fd669 100644
--- a/src/wp-admin/css/themes.css
+++ b/src/wp-admin/css/themes.css
@@ -31,8 +31,7 @@
 	top: -2px;
 	left: 20px;
 	margin: 0;
-	max-width: 280px;
-	width: 100%;
+	width: 280px;
 	font-size: 16px;
 	font-weight: 300;
 	line-height: 1.5;
@@ -1029,6 +1028,7 @@ body.folded .theme-overlay .theme-wrap {
 		right: 0;
 		margin: 10px 0;
 		width: 100%;
+		max-width: 280px;
 	}
 
 	.theme-browser .theme.add-new-theme span:after {