<!DOCTYPE?HTML>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
<title>定寬塊狀元素水平居中</title>
<style>
div{
????border:1px?solid?red;
width:200px;
margin:20px?auto;
}
</style>
</head>
<body>
<div>我是定寬塊狀元素，我要水平居中顯示。</div>
</body>
</html>
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