diff --git a/src/wp-admin/css/media.css b/src/wp-admin/css/media.css
index 5116568560..7526e4fcdb 100644
--- a/src/wp-admin/css/media.css
+++ b/src/wp-admin/css/media.css
@@ -1174,12 +1174,12 @@ audio, video {
 	max-width: 100%;
 }
 
-.mejs-container {
+.wp-core-ui .mejs-container {
 	width: 100%;
 	max-width: 100%;
 }
 
-.mejs-container .mejs-controls {
+.wp-core-ui .mejs-container * {
 	box-sizing: border-box;
 }