来自：https://blog.csdn.net/qq_38658877/article/details/78092649 侵删
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style type="text/css">
.example {
position: relative;
margin: 150px auto;
width: 50px;
height: 50px;
}
.dot:before {
content: ' ';
position: absolute;
z-index: 2;
left: 0;
top: 0;
width: 10px;
height: 10px;
background-color: #ff4200;
border-radius: 50%;
}
.dot:after {
content: ' ';
position: absolute;
z-index: 1;
width: 10px;
height: 10px;
background-color: #ff4200;
border-radius: 50%;
box-shadow: 0 0 10px rgba(0, 0, 0, .3) inset;
-webkit-animation: waveCircle 1s ease infinite normal;
/*-webkit-animation-name: ripple;
-webkit-animation-duration: 1s;
-webkit-animation-timing-function: ease;
-webkit-animation-delay: 0s;
-webkit-animation-iteration-count: infinite;
-webkit-animation-direction: normal;*/
}
@keyframes waveCircle {
0% {
left: 5px;
top: 5px;
width: 0;
height: 0;
}
100% {
left: -20px;
top: -20px;
opacity: 0;
width: 50px;
height: 50px;
}
}
</style>
</head>
<body>
<div class="example">
<div class="dot"></div>
</div>
</body>
</html>