Fix typo in default.css

assets/css/default.css

@@ -272,7 +272,6 @@ img.thumbnail {
   width: 100%;
   border-radius: 2px;
   background: #aaa;
-  display: none;
 }
 
 #download-progress {

assets/js/watch.js

@@ -79,6 +79,9 @@ function download_video(title) {
   xhr.onload = function(event) {
     if (event.currentTarget.status != 200) {
       console.log("Downloading " + title + " failed.")
+      document.getElementById("progress-container").style.display = "none";
+      progress.style.width = "0%";
+
       return;
     }