实例：脉冲波纹催眠动画特效
技术栈：HTML+CSS
效果：
源码：
【html】
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no">
<title>脉冲波纹催眠动画特效</title>
<link rel="stylesheet" href="165.css">
</head>
<body>
<div class="container">
<div class="circle"></div>
<div class="circle"></div>
<div class="circle"></div>
<div class="circle"></div>
