CSS入门案例（3）：太极图旋转

	<div class="bigbox">
        <div class="bbbox"></div>
        <div class="bwbox"></div>
        <div class="sbbox"></div>
        <div class="swbox"></div>
        <div class="lbbox"></div>
        <div class="lwbox"></div>
    </div>

		*{margin: 0;padding: 0;background: pink;}
        .bigbox{
            width: 600px;height: 600px;
            margin: 50px auto;
            position: relative;
            animation: move 5s infinite linear;
        }
        .bigbox .bbbox{
            width: 400px;height: 400px;
            background: black;
            border-radius: 50%;
            position: absolute;
            top: 100px;left: 100px;
        }
        .bigbox .bwbox{
            width: 200px;height: 400px;
            background: white;
            border-top-right-radius:  200px;
            border-bottom-right-radius: 200px;
            position: absolute;
            top: 100px;left: 300px;
        }
        .bigbox .sbbox{
            width: 100px;height: 200px;
            background: black;
            position: absolute;
            border-top-right-radius:  100px;
            border-bottom-right-radius: 100px;
            top: 100px;left: 300px;
        }
        .bigbox .swbox{
            width: 100px;height: 200px;
            background: white;
            position: absolute;
            border-top-left-radius:  100px;
            border-bottom-left-radius: 100px;
            top: 300px;left: 200px;
        }
        .bigbox .lbbox{
            width: 50px;height: 50px;
            background: black;
            position: absolute;
            border-radius: 50%;
            top: 375px;left: 275px;
        }
        .bigbox .lwbox{
            width: 50px;height: 50px;
            background: white;
            position: absolute;
            border-radius: 50%;
            top: 175px;left: 275px;
        }
        @keyframes move{
            from{transform: rotate(0deg);}
            to{transform: rotate(360deg);}
        }