<span style="font-size:18px;"><!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>实现冲击波--数学知识很重要</title>
<style>
*{
margin:0;
padding:0;
box-sizing:border-box;
}
html,body{
font-family:"微软雅黑";
}
.wave{
position:relative;
float:left;
50%;
height:420px;
}
.wave a{
position:absolute;
top:50%;
left:50%;
display:inline-block;
120px;
height:50px;
margin-left:-60px;
margin-top:-25px;
line-height:50px;
text-align:center;
border-radius:5px;
color:red;
font-size:16px;
cursor:pointer;
/*overflow:hidden;*/
}
#wave1{
background-color:blue;
}
#wave1 a{
background-color:pink;
}
#wave1 a:after{
content: "";
display: block;
position: absolute;
left: -40px;
top: -75px;
200px;
height: 200px;
background: rgba(255,255,255,0.8);
border-radius: 50%;
opacity:0;
transition: all 1s;
}
#wave1 a:active:after{
0;
height: 0;
left:60px;
top: 25px;
opacity: 1;
transition-duration: 0s;
}
</style>
</head>
<body>
<div class="wave" id="wave1">
<a>点我</a>
</div>
</body>
</html>