Work on closed notice.

src/closed.js

@@ -3,6 +3,7 @@
  *
  * In it, we fill the screen evenly with "closed" messages. The locations are
  */
+require('./closed.scss');
 /**
  * Contains the state for this demo.
  *

src/closed.scss

@@ -0,0 +1,34 @@
+@keyframes fadeOut {
+  0% {
+    opacity: 1;
+  }
+
+  100% {
+    opacity: 0;
+  }
+}
+
+body.closed {
+  background: #f66;
+  text-align: center;
+
+  .closed_notice {
+    position: absolute;
+    font-weight: bold;
+    font-size: 16pt;
+    text-transform: uppercase;
+    animation: fadeOut 3s forwards;
+    animation-timing-function: linear;
+    animation-iteration-count: 1;
+  }
+
+  #stop-overlay {
+    z-index: 1;
+    position: absolute;
+    top: 0;
+    left: 0;
+    width: 100%;
+    height: 100%;
+    background-size: contain;
+  }
+}