边框----圆圈
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8>
<title>边框</title>
<style type="text/css">
.box{width:100px; height:100px; border:1px dotted #ccc; border-radius:50px; background:pink;}</style>
</head>
<div class="box">php.cn</div>
<body>
</body>
</html>