less intrusive camera controls

index.html

@@ -45,7 +45,7 @@
         dis parturient montes, nascetur ridiculus mus.
     </p>
 
-    <div id="atlas-container"></div>
+<!--    <div id="atlas-container"></div>-->
 </main>
 
 <script type="module">
@@ -58,7 +58,7 @@
             const engine = new Engine();
 
             // Append the texture atlas to the bottom for debugging
-            document.getElementById('atlas-container').appendChild(engine.atlas.canvas);
+            document.getElementById('atlas-container')?.appendChild(engine.atlas.canvas);
 
             // 2. Setup Figure 1 (Shared: Wire & Repeater | Unique: Trapdoor)
             const demo1 = new Diorama('demo-1', engine);