diff --git a/index.html b/index.html
index f3d613b..adefdbd 100644
--- a/index.html
+++ b/index.html
@@ -7,9 +7,9 @@
   </head>
   <body>
     <div id='app'>
+      <div class="demo" :style="{backgroundColor: color}"></div>
       <div class="demo" :style="myStyle"></div>
-      <div class="demo"></div>
-      <div class="demo"></div>
+      <div class="demo" :style="[myStyle, {height: width + 'px'}]"></div>
       <hr>
       <input type="text"  v-model="color">
       <input type="text"  v-model="width">
