老师检查一下代码

来源：4-3 编程练习

ShanaZ

2019-03-18 22:37:21

<!DOCTYPE html>
<html>
<head>
    <meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin: 0;
padding: 0;
}
.page{
width: 100%;
           height: 4020px;
background:url(http://climg.mukewang.com/59c9f7ce0001839219034033.png) center top no-repeat;
}

.left{
width: 100%;
           height: 400px;
background: url(http://climg.mukewang.com/5a3383c70001f1b702240364.png) left no-repeat;
position: fixed;
left:0;
top: 50%;
margin-top:-200px;
}

.right{
width: 100%;
           height: 400px;
background: url(http://climg.mukewang.com/5a3383d00001a3dd02240364.png) right center no-repeat;
position: fixed;
left:0;
top: 50%;
margin-top:-200px;
}


</style>
</head>
<body>
<div class="page">
<div class="left"></div>
<div class="right"></div>
</div>
</body>
</html>

我想问下广告的height设置成100%或者 width设置成auto为什么不行呢

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