diff --git a/frontend/biochem.html b/frontend/biochem.html
index f4dc606..d16be75 100644
--- a/frontend/biochem.html
+++ b/frontend/biochem.html
@@ -1678,10 +1678,12 @@ function toggle3D() {
   vdwBtn.style.display = _is3D ? '' : 'none';
   if (!_is3D && _isVDW) { _isVDW = false; vdwBtn.classList.remove('mode-3d-active'); }
   if (_is3D) {
+    canvas.style.cursor = 'grab';
     centerView();
     _start3D();
   } else {
     _stop3D();
+    canvas.style.cursor = 'crosshair';
     render();
   }
 }