fix too-tall download button

www/media/inner.html

@@ -15,13 +15,15 @@
         padding: 0px;
         display: inline-block;
     }
+
     media-tag * {
         max-width: 100%;
         margin: auto;
         display: block;
+    }
+    media-tag *:not(button) {
         height: 100%;
     }
-
     media-tag video {
         min-width: 100%;
         max-height: 100%;