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css3 过度效果之物体向上冒出

<!DOCTYPE HTML><html><head><meta charset="utf-8"/><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>无标题文档</title><link type="text/css" href="animate.css"/></head><style>    .container{ width:960px; height:600px; margin:30px auto; position:relative;}    .bottom1{ position:absolute; bottom:246px; background:url(img/bottom2.png); height:107px; width:960px;}    .bottom2{ position:absolute; bottom:200px; background:url(img/bottom1.png); height:46px; width:960px; z-index:4;}    .rub{ position:absolute; bottom:246px;  left:357px; width:246px; height:200px; background:url(img/rub.png); z-index:2;                animation:myfirst 1500ms;    }    .cover{position:absolute; bottom:0px; background:#fff; height:230px; width:960px; z-index:3}        @keyframes myfirst    {    0%   {bottom:0px;}    100% {bottom:246px;}    }                </style><body>    <div class="container">        <div class="rub"></div>        <div class="bottom1"></div>                <div class="bottom2"></div>        <div class="cover"></div>    </div></body></html>

小兔子会从椭圆中间向上显示出来。可模仿建筑物突起等功能