In the spirit of [27622], add a few CSS rules to ensure that videos will be responsive, regardless of theme.

Props Funkatronic.
Fixes #28414.

Built from https://develop.svn.wordpress.org/trunk@28650


git-svn-id: http://core.svn.wordpress.org/trunk@28468 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/js/mediaelement/wp-mediaelement.css

@@ -88,6 +88,12 @@
 	margin: 0 0 10px;
 }
 
+video.wp-video-shortcode,
+.wp-video-shortcode video {
+	max-width: 100%;
+	display: inline-block;
+}
+
 .video-details .wp-video-holder {
 	width: 100%;
 	max-width: 640px;