Update app.py

app.py

@@ -1124,16 +1124,15 @@ with gr.Blocks(css=css, js=js, head=head) as demo:
               <canvas id='cnv_out'></canvas>
               <div id='compass_box'><div id='compass'><a id='fullscreen' onclick='
                 const model3D = document.getElementById(\"model3D\");
-                if (model3D.style.width != window.innerWidth/2 + \"px\") {
-                  model3D.style.width = window.innerWidth/2 + \"px\";
-                  model3D.style.height = window.innerHeight/2 + \"px\";
+                if (model3D.parentNode.tagName != \"BODY\") {
+                  window.modelContainer = model3D.parentNode.id;
+                  document.body.appendChild(model3D);
                   model3D.style.position = \"fixed\";
                   model3D.style.left = \"0\";
                   model3D.style.top = \"0\";
                   model3D.style.zIndex = \"100\";
                 } else {
-                  model3D.style.width = \"initial\";
-                  model3D.style.height = \"initial\";
+                  document.getElementById(window.modelContainer).appendChild(model3D);
                   model3D.style.position = \"initial\";
                   model3D.style.left = \"initial\";
                   model3D.style.top = \"initial\";