CSS3实现阴阳鱼

直接上代码：
<!doctype html>

<html>

<head>

    <meta charset="utf-8" />

    <title>阴阳鱼</title>

    <style>

        body { background: #F0DFAD; }

        .yin-yang { position: fixed; top: 50%; left: 50%; margin: -5rem 0 0 -5rem; height: 10rem; width: 10rem; border-radius: 50%; background: -webkit-linear-gradient(top, #fff 0%, #fff 50%, #000 50%, #000 100%); background: linear-gradient(to bottom, #fff 0%, #fff 50%, #000 50%, #000 100%); box-shadow: 0 0 1rem rgba(0, 0, 0, 0.4); -webkit-animation: rotate 10s linear infinite; animation: rotate 10s linear infinite; }

        @-webkit-keyframes rotate {

            0% { -webkit-transform: rotate(0); transform: rotate(0); }

            100% { -webkit-transform: rotate(360deg); transform: rotate(360deg); }

        }

        @keyframes rotate {

            0% { -webkit-transform: rotate(0); transform: rotate(0); }

            100% { -webkit-transform: rotate(360deg); transform: rotate(360deg); }

        }

        .yin-yang:before,

        .yin-yang:after { content: ''; box-sizing: border-box; position: absolute; top: 50%; -webkit-transform: translateY(-50%); transform: translateY(-50%); height: 50%; width: 50%; border-radius: 50%; }

        .yin-yang:before { left: 0; background: #FFF; border: 2rem solid #000; }

        .yin-yang:after { right: 0; background: #000; border: 2rem solid #fff; }

    </style>

</head>

<body>

    <div class="yin-yang"></div>

</body>

</html>
来源：http://codepen.io/sfi0zy/pen/ALrAvd
巴特西

CSS3实现阴阳鱼

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