diff --git a/src/wp-admin/css/media.css b/src/wp-admin/css/media.css
index 21f4786b02..d7b8af268b 100644
--- a/src/wp-admin/css/media.css
+++ b/src/wp-admin/css/media.css
@@ -1145,6 +1145,10 @@ audio, video {
 	max-width: 100%;
 }
 
+.mejs-container .mejs-controls {
+	box-sizing: border-box;
+}
+
 /* =Media Queries
 -------------------------------------------------------------- */