@@ -21,7 +21,23 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+   :root{
+--spacing:10px;
+--blur: 2px;
+--base: #fff221;
 
+   }
+
+  img{
+    background: var(--base);
+    padding: var(--spacing);
+    filter: blur(var(--blur));
+  } 
+
+
+  .hl{
+    color: var(--base);
+  }
     /*
       misc styles, nothing to do with CSS variables
     */
@@ -48,6 +64,16 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+  const inputs = document.querySelectorAll('.controls input');
+ function handleUpdate(){
+  const suffix = this.dataset.sizing || '';
+  document.documentElement.style.setProperty(`--${this.name}`,this.value +suffix);
+  
+ }
+
+ inputs.forEach(input => input.addEventListener('change', handleUpdate));
+  
+inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
   </script>
 
 </body>