<html>
<head>
<title>网页怎么居中</title>
<style type="text/css">
#all {
position:absolute;
width:100%;
height:768px;
z-index:1;
left: 0px;
top: 0px;
}
#all #main {
background-color: #CCC;
height: 768px;
width: 1024px;
margin-right: auto;
margin-left: auto;
}
</style>
</head>
<body>
<div id="all">
<div id="main"></div>
</div>
</body>
</html>
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