Once again, with webpack.

src/closed.scss

@@ -11,6 +11,7 @@
 body.closed {
   background: #f66;
   text-align: center;
+  overflow: hidden;
 
   .closed_notice {
     position: absolute;
@@ -30,5 +31,8 @@ body.closed {
     width: 100%;
     height: 100%;
     background-size: contain;
+    background-repeat: no-repeat;
+    background-image: url(stop.svg);
+    background-position: 50% 50%;
   }
 }