diff --git a/01-color-flipper/setup/index.html b/01-color-flipper/setup/index.html
index 2aff83646..0e8f07200 100644
--- a/01-color-flipper/setup/index.html
+++ b/01-color-flipper/setup/index.html
@@ -12,5 +12,11 @@
     <h1>color flipper</h1>
     <!-- javascript -->
     <script src="app.js"></script>
+    <main>
+        <div class="container">
+            <h2>background color : <span class="color">#f1f5f8</span></h2>
+            <button class="btn btn-hero" id="btn">click me</button>
+        </div>
+    </main>
   </body>
 </html>