现在css3越来越流行，有些效果也比较简单，比较好看，鲍余网络团队整理了一个简单的代码，只为能抛砖引玉。亲们，快收下吧！
附代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>图片上下缓动</title>
</head>
<style type="text/css">
.mouseDown{ position:absolute; left:50%; margin-left:-16px; top:200px; cursor:pointer;}
.mouseDown{-webkit-transform-style: preserve-3d;-moz-transform-style: preserve-3d;-ms-transform-style: preserve-3d;-o-transform-style: preserve-3d;-webkit-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-moz-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-ms-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-o-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-webkit-animation:animations56 0.8s ease infinite;-moz-animation:animations56 0.8s ease infinite;-ms-animation:animations56 0.8s ease infinite;-o-animation:animations56 0.8s ease infinite;}
@-webkit-keyframes animations56{
0%{-webkit-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-moz-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-ms-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-o-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);}
50%{-webkit-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 10px, 0px);-moz-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-ms-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-o-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);}
100%{-webkit-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-moz-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-ms-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);-o-transform: rotateZ(0deg) rotateY(0deg) rotateX(0deg) translate3d(0px, 0px, 0px);}
</style>
<body style="background:#000">
<span class="mouseDown" alt="点击往下">
<img src="mouse_down.png"></span>
</body>
</html>
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