Web2.0中，圆角效果是很常见的，以前都是用图片来模仿，现在直接用css就能实现，例子代码如下
Html代码：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>Untitled Document</title>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<style type="text/css">
body{
padding: 20px;
background-color: #FFCC66;
font: 100.01% "Trebuchet MS", "Verdana", "Arial", "sans-serif";
color: #000000;
}
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#roundconner{ margin: 0 10%;background: #9BD1FA}
b.rtop, b.rbottom{display:block;background: #FFCC66}
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>
<body>
<div id="roundconner">
<b class="rtop"><b class="r1"></b><b class="r2"></b><b class="r3"></b><b class="r4"></b></b>
123123123
zvzvzvxzv
asdfaer23424311212313
afasdfasdfasdfasd
dadsfasdfsaaaaaaaaaaaaaaa
asdfaaaaaaaaaaaaaaaaaaaaaaaaaaafadsfasdfasdfsaf
<b class="rbottom"><b class="r4"></b><b class="r3"></b><b class="r2"></b><b class="r1"></b></b>
</body>
</html>
只要新建一个html文件，把里面都内容全部替换成上面的代码就可以看到效果了