纯CSS圆角框，无背景图片。可以无限拉伸，但有冗余标签。
效果图：
代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
*{padding:0;margin:0;}
.container {width:50%;margin:10px auto;}
.holder2 {color:#000;}
/*无图片的圆角框*/
.b1 {height:1px; font-size:1px; overflow:hidden; display:block; background:#aaa; margin:0 5px;}
.b2 {height:1px; font-size:1px; overflow:hidden; display:block; background:#fff; border-right:2px solid #aaa; border-left:2px solid #aaa; margin:0 3px;}
.b3 {height:1px; font-size:1px; overflow:hidden; display:block; background:#fff; border-right:1px solid #aaa; border-left:1px solid #aaa; margin:0 2px;}
.b4 {height:2px; font-size:1px; overflow:hidden; display:block; background:#fff; border-right:1px solid #aaa; border-left:1px solid #aaa; margin:0 1px;}
.content {border-right:1px solid #aaa; height:200px;border-left:1px solid #aaa;}
</style>
</head>
<body>
<div class="container">
<div class="holder">
<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>
<div class="content">
<p>纯CSS的圆角框</p>
</div>
<b class="b4"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b>
</div>
</div>
<div class="container">
<div class="holder">
<b class="b1"></b><b class="b2"></b><b class="b3"></b><b class="b4"></b>
<div class="content">
<p>纯CSS的圆角框</p>
</div>
<b class="b4"></b><b class="b3"></b><b class="b2"></b><b class="b1"></b>
</div>
</div>
</body>
</html>
插入图片
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