效果代码

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-casle=1.0,user-scalable=no" />
<title>圆点扩散</title>
<style type="text/css">
body {
background:
}
.tips {
width: 6px;
height: 6px;
position: relative;
cursor: pointer;
margin: 120px auto 0;
}
.tips b {
width: 100%;
height: 100%;
background:
border-radius: 50%;
display: block;
background-color: rgba(255, 255, 255, 0.6);
position: absolute;
left: 0;
top: 0;
z-index: 1;
}
.tips b:nth-of-type(1) {
-webkit-animation: click1 1s linear infinite;
animation: click1 1s linear infinite;
background-color:
/* opacity: .7; */
}
.tips b:nth-of-type(2) {
-webkit-animation: click2 1s linear infinite;
animation: click2 1s linear infinite