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来源：2-11 编程练习

陈淑雯

2021-05-09 16:29:01

相关代码：

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>边框</title>
    <style>
        /*补充代码*/
        .box{
            position: relative;
        }
        .box .bd1{
            width: 0;
            height: 0;
            border: 200px solid transparent;
            border-radius: 30%;
            border-left-color: red;
        }
        .box .bd2{
            width: 0;
            height: 0;
            border: 200px solid transparent;
            border-radius: 30%;
            border-right-color: red;
            position: absolute;
            top:0;
            left: -32px;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="bd1"></div>
        <div class="bd2"></div>
    </div>
</body>

</html>