<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<style type=‘text/css‘>
.circle {
width: 200px;
height: 200px;
position: absolute;
top: 50%;
left: 50%;
margin: -100px 0 0 -100px;
}
.circle1,
.circle2,
.circle3,
.center {
position: absolute;
left: 50%;
top: 50%;
margin: -30px 0 0 -30px;
width: 60px;
height: 60px;
border-radius: 30px;
background-color: #666666;
}
.center {
position: absolute;
left: 50%;
top: 50%;
margin: -35px 0 0 -35px;
width: 70px;
height: 70px;
border-radius: 35px;
background: #111111;
/ text-align: center;
line-height: 70px;
color: #EAEAEA;
font-size: 16px;
font-family: ‘‘;
}
.circle1 {
-webkit-animation: circle 3s linear infinite;
animation: circle 3s linear infinite;
}
.circle2 {
-webkit-animation: circle 3s linear 0.8s infinite;
animation: circle 3s linear 0.8s infinite;
}
.circle3 {
-webkit-animation: circle 3s linear 1.6s infinite;
/* Safari and Chrome */
animation: circle 3s linear 1.6s infinite;
}
@-webkit-keyframes circle {
/* Safari and Chrome */
from {
opacity: 1;
-webkit-transform: scale(0);
}
to {
opacity: 0;
-webkit-transform: scale(3);
}
}
</style>
</head>
<body>
<div class=‘circle‘>
<div class=‘circle1‘> </div>
<div class=‘circle2‘> </div>
<div class=‘circle3‘> </div>
<div class=‘center‘></div>
</div>
</body>
</html>
原文：http://www.cnblogs.com/qq1010113045/p/7089129.html