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一個div畫太極

程式碼:

​
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>div畫太極</title>
    <style>
        *{
            margin:0px;
            padding:0; 
            background-color: #ccc;           
        }
        div{
           margin:20px auto;
            width:0;
            height:400px;
            border-left: 200px solid #000;
            border-right:200px solid #fff;
            border-radius: 100%;
            box-shadow:0 0 50px #000;
        }
        div:before{
            content:"";
            display:block;
            width:75px;
            height: 75px;
            margin-left: -100px;
            border:62px solid #000;
            background-color:#fff;
            border-radius:100%;
        }
        div:after{
            content:"";
            display:block;
            width:75px;
            height: 75px;
            margin-left: -100px;
            border:63px solid #fff;
            background-color:#000;
            border-radius:100%;
        }

    </style>
</head>
<body>
    <div></div>
</body>
</html>

​

效果圖