为什么我设置的盒子不往下移动而是和背景图重叠在一起？ padding不管用啊
<html>
<head>
<title>.</title>
<style type="text/css">
.conten{border:2px solid gray;padding:350px;}
.book{border:2px solid gray;background:url(21&gp0.jpg)no-repeat blue;}
img{margin:10px 10px;width:225px;height:200px;
</style>
</head>
<body>
<div class="content book">
<img src="32072_1294470_bee08.jpg">
<img src="32072_1294474_9a496.jpg">
<img src="32072_1294495_743f0.jpg">
</div>
</body>
</html>
