Ticket #43640: 43640.2.diff

src/wp-admin/css/media.css

@@ -1174 +1174 @@
         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;
 }