<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style type="text/css">
#img{
width:200px;
height:200px;
border:100px solid green;
border-left-color: red;
border-right-color: black;
border-top-color: yellow;
margin:100px;
border-radius:50%;
-webkit-animation:circle 1s infinite linear;
-moz-animation:circle 1s infinite linear;
}
@-webkit-keyframes circle{
0%{ transform:rotate(0deg); }
100%{ transform:rotate(-360deg); }
}
@-moz-keyframes circle{
0%{ transform:rotate(0deg); }
100%{ transform:rotate(-360deg); }
}
</style>
</head>
<body>
<div id="img"></div>
</body>
</html>
原文：http://www.cnblogs.com/wangbenqing/p/7025779.html