Implement basic 3d rendering.

src/index.js

@@ -1,9 +1,9 @@
 import {startClosedAnimation} from "./closed";
-import "./open"
+import {startOpenAnimation} from "./open";
 
 window.addEventListener('load', function () {
     if (document.body.classList.contains('open')) {
-        // TODO: leave it in HTML/CSS for now.
+        startOpenAnimation();
     } else {
         startClosedAnimation();
     }