先看效果图：
代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>小水球</title>
<style>
*{
margin:0;
padding: 0;
}
body{
height: 100vh;
background: linear-gradient(rgb(95,95,250) 10%,rgb(3,3,110));
}
.main,.wave{
width:200px;
height:200px;
border-radius: 50%;
position: absolute;
left: 50%;
top:50%;
transform: translate(-50%,-50%);
}
.main{
border:3px solid darkturquoise;
padding: 10px;
}
.wave{
background: darkturquoise;
overflow: hidden;
}
.wave::before{
content: "水球";
position: absolute;
left: 50%;
top: 0px;
color: darkturquoise;
z-index: 99;
transform: translate(-50%,30px);
text-transform: uppercase;
}
.wave::after{
content: "";
width: 300px;
height: 300px;
background: rgba(255,255,255,0.8);
position: absolute;
left: 50%;
top: 0;
transform: translate(-50%,-60%);
border-radius: 40%;
animation: wave 5s linear infinite;
}
@keyframes wave{
100%{
transform: translate(-50%,-60%) rotate(360deg);
}
}
</style>
</head>
<body>
<div class="main">
<div class="wave"></div>
</div>
</body>
</html>
原文：https://www.cnblogs.com/lonelyxmas/p/12945779.html