纯css制作圆角矩形边框

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>

<style type="text/css">
*{ margin:0px; padding:0px;}
div#nifty{ margin: 0 10%;}
p {padding:10px; border-left:1px #000 solid;border-right:1px #000 solid;}
div.rtop,div.rtopbottom{display:block;background: #FFF}
div.rtop div,div.rtopbottom div{display:block;height: 1px;overflow: hidden; }
div.r1{margin: 0 5px; border:1px #000 solid; border-bottom:none;}
div.r2{margin: 0 3px; border-left:1px #000 solid;border-right:1px #000 solid;}
div.r3{margin: 0 2px; border-left:1px #000 solid;border-right:1px #000 solid;}
div.rtop div.r4{margin: 0 1px;height: 2px;border-left:1px #000 solid;border-right:1px #000 solid; }
div.rtopbottom div.r1{margin: 0 5px;border:1px #000 solid;border-top:none; }
</style>
</head>

<body>

<div id="nifty">
<div class="rtop"><div class="r1"></div><div class="r2"></div><div class="r3"></div><div class="r4"></div></div>
<p>这里是你的正文内容</p>
<div class="rtopbottom"><div class="r4"></div><div class="r3"></div><div class="r2"></div><div class="r1"></div></div>
</div>
</body>
</html>