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>
html {
font-size: 20px;
}
body {
background: #444;
}
.animate .w2 {
-webkit-animation-delay: 1s;
}
.animate .w3 {
-webkit-animation-delay: 2s;
}
.animate .w4 {
-webkit-animation-delay: 3s;
}
.wave {
width: 22.7rem;
height: 22.7rem;
position: absolute;
top: 0;
left: 0;
right: 0;
margin: 0 auto;
}
.wave * {
border: 1px solid #fff;
position: absolute;
border-radius: 50%;
-webkit-animation: opac 4s infinite;
}
@-webkit-keyframes opac {
from {
opacity: 1;
width: 0;
height: 0;
top: 50%;
left: 50%;
}
to {
opacity: 0;
width: 100%;
height: 100%;
top: 0;
left: 0;
}
}
</style>
</head>
<body>
<div class="animate wave">
<div class="w1"></div>
<div class="w2"></div>
<div class="w3"></div>
<div class="w4"></div>
</div>
</body>
</html>