css3

<!--卡牌反转-->
<div class="demo1">
    <div class="box">
        <div class="negative"></div>
        <div class="positive"></div>
    </div>
</div>

 .demo1{width: 200px;height: 300px;margin: 100px auto;}
        .demo1 .box{width:100%;height: 100%;position: relative;transform-style: preserve-3d;transition: transform 1s;cursor: pointer; animation:fanzhuan 2s infinite linear ;  }
        .demo1 .positive{width: 100%;height: 100%;position: absolute;background:url("image/positive.png") 0 0 no-repeat;background-size: 100% 100%;}
        .demo1 .negative{width: 100%;height: 100%;position: absolute;background:url("image/negative.jpg") 0 0 no-repeat;background-size: 100% 100%;transform:rotateY(180deg);}
        .demo1 .box:hover{ transform:rotateY(180deg); }
        @keyframes fanzhuan{
            0%{ transform:rotateY(0deg);  }
            100%{  transform:rotateY(360deg);  }
        }