<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <style type="text/css">
       /* 填写样式 */
       .box{
        width:100px;
        height:100px;
        padding:20px;
        margin:10px;
       }
    </style>
</head>

<body>
    <div class="box">
</div>
    <script type="text/javascript">
        // 填写JavaScript
        
    </script>
</body>

</html>