switch to video.js

src/styles/includes/preview.less

@@ -106,6 +106,11 @@ padding: 0px;
 	padding-bottom: 30px;
 }
 
+video, audio {
+  margin: 0 auto;
+  width: 100%;
+}
+
 .wrap {
   width: 40%;
   height: 40%;