diff --git a/03 - CSS Variables/index-FINISHED.html b/03 - CSS Variables/index-FINISHED.html
index c931959a74..c1c5452e64 100644
--- a/03 - CSS Variables/index-FINISHED.html	
+++ b/03 - CSS Variables/index-FINISHED.html	
@@ -43,6 +43,9 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
     body {
       text-align: center;
+    }
+
+    body {
       background: #193549;
       color: white;
       font-family: 'helvetica neue', sans-serif;
@@ -60,6 +63,11 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+// First step: query all inputs.
+// Step two: iterate over inputs, add 'change' and 'mousemove' event handlers
+// Step three: define that event handler
+    // b.) have event handler update CSS variable
+
     const inputs = document.querySelectorAll('.controls input');
 
     function handleUpdate() {
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 8a4f0d556e..8d4a92d8c5 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -1,9 +1,12 @@
 <!DOCTYPE html>
+
 <html lang="en">
+
 <head>
   <meta charset="UTF-8">
   <title>Scoped CSS Variables and JS</title>
 </head>
+
 <body>
   <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
@@ -21,7 +24,17 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+     :root {
+      --spacing: 10px;
+      --blur: 10px;
+      --base: #ffc600;
+    }
 
+    img {
+      padding: var(--spacing);
+      filter: blur(var(--blur));
+      background-color: var(--base);
+    }
     /*
       misc styles, nothing to do with CSS variables
     */
@@ -40,12 +53,24 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
     }
 
     input {
-      width:100px;
+      width: 100px;
     }
   </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>
-</html>
+
+</html>
\ No newline at end of file
