fix player cover

web/css/yt2.css

@@ -426,6 +426,10 @@ header .right a.github {
   position: relative;
   float: left;
   width: 100%;
+  height: 100%;
+}
+.join .box video {
+  float: left;
 }
 .join .box .image img {
   width: 100%;