diff --git a/src/wp-includes/js/mediaelement/wp-mediaelement.css b/src/wp-includes/js/mediaelement/wp-mediaelement.css
index c67bdb4a7c..11bee2edba 100644
--- a/src/wp-includes/js/mediaelement/wp-mediaelement.css
+++ b/src/wp-includes/js/mediaelement/wp-mediaelement.css
@@ -74,6 +74,8 @@
 
 .wp-playlist audio {
 	display: none;
+	max-width: 100%;
+	width: 400px;
 }
 
 .wp-playlist .mejs-container {