请老师检查代码有没有可以优化的
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>对联广告</title>
<style type="text/css">
*{padding: 0;margin: 0 auto;}
.content{background-image: url(http://img1.sycdn.imooc.com/climg//59c9f7ce0001839219034033.png);
width: 1903px;
position: relative;
height: 4033px;}
.left-div{background-image: url(http://img1.sycdn.imooc.com/climg//5a3383d00001a3dd02240364.png);
width: 224px;
position: fixed;
left: 0;
top: 50%;
margin-top: -112px;
height: 364px;}
.right-div{background-image: url(http://img1.sycdn.imooc.com/climg//5a3383c70001f1b702240364.png);
width: 224px;
right: 0;
top: 50%;
margin-top: -112px;
position: fixed;
height: 364px;}
}
</style>
</head>
<body>
<div class="content">
<div class="left-div">
</div>
<div class="right-div">
</div>
</div>
</body>
</html>
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