@@ -22,6 +22,23 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <style>
 
+    :root {
+        --base: #ffc600;
+        --spacing: 10px;
+        --blur: 10px;
+    }
+    
+    img {
+        padding: var(--spacing);
+        background: var(--base);
+        filter: blur(var(--blur));
+    }
+    
+    .hl {
+        color: var(--base);
+    }
+
+
     /*
       misc styles, nothing to do with CSS variables
     */
@@ -48,6 +65,16 @@ <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>