css3在线制作半圆实例

编辑代码

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>CSS3 border-radius属性</title>
    <style type="text/css">
    #box
    {
        width:200px;
        height:100px;
        border-radius:100px 100px 0 0;
        background-color:red;
    }
    </style>
</head>
<body>
    <div id="box">
    </div>
</body>
</html>