请问代码是否有问题？主体部分的三张图片可否作为背景图片同时使用
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{
margin:0;
padding:0;
font-family: "微软雅黑";
color:white;
text-decoration:none;
}
.header{
width: 100%;
height: 100px;
background-color: black;
/*text-align: center;*/
position: fixed;
top:0;
font-size: 30px;
overflow: hidden;
}
.nav{
float:left;
}
.bar{
float:right;
}
span{
line-height: 100px;
margin-right: 100px;
}
.container{
/*text-align: center;*/
width: 100%;
margin-top: 100px;
margin-bottom: 100px;
}
.container img{
width: 100%;
height: 100%;
display: block;
}
.footer{
width: 100%;
height: 100px;
background-color: black;
text-align: center;
position: fixed;
bottom: 0;
font-size: 20px;
}
</style>
</head>
<body>
<div class="header">
<div class="nav">
<a href="#"><img src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png"></a>
</div>
<div class="bar">
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</div>
</div>
<div class="container">
<img src="http://img1.sycdn.imooc.com/climg//58c0eda50001e12416000480.jpg">
<img src="http://img1.sycdn.imooc.com/climg//58c0edb80001c9f216000480.jpg">
<img src="http://img1.sycdn.imooc.com/climg//58c0edc9000100d516000480.jpg">
</div>
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</body>
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可以一起写三张，但是每一张都需要单独设置背景图片的位置，比如：
希望可以帮到你！
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