diff --git a/nfem/visualization/canvas_3d_html.py b/nfem/visualization/canvas_3d_html.py
index 4ac6f4e..df4278b 100644
--- a/nfem/visualization/canvas_3d_html.py
+++ b/nfem/visualization/canvas_3d_html.py
@@ -603,7 +603,7 @@
     });
 
 
-    window.addEventListener( 'resize', onWindowResize, false );
+    window.addEventListener('resize', onWindowResize, false);
 
     function onWindowResize(){
         camera.aspect = window.innerWidth / height;
@@ -611,6 +611,8 @@
 
         renderer.setSize(window.innerWidth, height);
 
+        timestepSlider.setAttribute("style", `width: ${width}px;`);
+
         render();
     }