CSS 圆角边框

<div id="nifty">
    <b class="rtop"><b class="r1"></b><b class="r2"></b>
    <b class="r3"></b><b class="r4"></b></b>
    <h1>演示代码</h1>

    <style type="text/css">
        body{padding: 20px;background-color: #FFF;
        font: 100.01% "Trebuchet MS",Verdana,Arial,sans-serif}
        h1,h2,p{margin: 0 10px}
        h1{font-size: 250%;color: #FFF}
        h2{font-size: 200%;color: #f0f0f0}
        p{padding-bottom:1em}
        h2{padding-top: 0.3em}
        div#nifty{ margin: 0 10%;background: #9BD1FA}
        b.rtop, b.rbottom{display:block;background: #FFF}
        b.rtop b, b.rbottom b{display:block;height: 1px;
        overflow: hidden; background: #9BD1FA}
        b.r1{margin: 0 5px}
        b.r2{margin: 0 3px}
        b.r3{margin: 0 2px}
        b.rtop b.r4, b.rbottom b.r4{margin: 0 1px;height: 2px}
    </style>

    <b class="rbottom"><b class="r4"></b><b class="r3"></b>
    <b class="r2"></b><b class="r1"></b></b>
    </div>

/////////下面是另外一个示例..本来用jquery.corner 也可以弄的，但是感觉太复杂了。。所以不用那个了。

<style type="text/css">

#xsnazzy h1, #xsnazzy h2, #xsnazzy p {margin:0 10px; letter-spacing:1px;}
#xsnazzy h1 {font-size:2.5em; color:#fff;}
#xsnazzy h2 {font-size:2em;color:#06a; border:0;}
#xsnazzy p {padding-bottom:0.5em;}
#xsnazzy h2 {padding-top:0.5em;}
#xsnazzy { background: transparent;margin:1em;}

.xtop, .xbottom {display:block;background:transparent; font-size:1px;}
.xb1, .xb2, .xb3, .xb4 {display:block; overflow:hidden;}
.xb1, .xb2, .xb3 {height:1px;}
.xb2, .xb3, .xb4 { background:#ccc; border-left:1px solid #08c; border-right:1px solid #08c;}
.xb1 {margin:0 5px; background:#08c;}
.xb2 {margin:0 3px; border-width:0 2px;}
.xb3 {margin:0 2px;}
.xb4 {height:2px; margin:0 1px;}

.xboxcontent {display:block;background:#ccc;  border:0 solid #08c; border-width:0 1px;}

</style>

<div id="xsnazzy">
<b class="xtop"><b class="xb1"></b><b class="xb2"></b><b class="xb3"></b><b class="xb4"></b></b>
<div class="xboxcontent">
<h1>Snazzy Borders</h1>
<p>Based on Nifty Corners By Alessandro Fulciniti<br />http://pro.html.it/esempio/nifty/</p>

<h2>Rounded borders without images</h2>
<p>Lorem ipsum dolor sit amet, consectetuer adipiscing elit, sed diam nonummy nibh
  euismod tincidunt ut laoreet dolore magna aliquam erat volutpat. Ut wisi enim
  ad minim veniam, quis nostrud exerci tation ullamcorper suscipit lobortis nisl
  ut aliquip ex ea commodo consequat.</p>
<p>Duis autem vel eum iriure dolor in hendrerit
  in vulputate velit esse molestie consequat, vel illum dolore eu feugiat nulla
  facilisis at vero eros et accumsan et iusto odio dignissim qui blandit praesent
  luptatum zzril delenit augue duis dolore te feugait nulla facilisi.</p>
</div>
<b class="xbottom"><b class="xb4"></b><b class="xb3"></b><b class="xb2"></b><b class="xb1"></b></b>
</div>

///如果只需要边框 把 xboxcontent中的 background 和 xb2.xb3.xb4 中的background 去掉就OK了.