这个为什么不行啊，能解答一下吗
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>111</title>
<style type="text/css">
body{margin:0;padding:0:}
.lee{width:800px;height:300px;background:#cc3908;margin 0 auto}
</head>
<body>
<div class="lee">
</div>
</body>
</html>
