<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>水波纹效果</title>
<style>
.btn {
position: relative;
background-color: #4CAF50;
border: none;
font-size: 28px;
color: #FFFFFF;
padding: 20px;
width: 200px;
text-align: center;
-webkit-transition-duration: 0.4s; /* Safari */
transition-duration: 0.4s;
text-decoration: none;
overflow: hidden;
cursor: pointer;
}
.ripple {
position: relative;
overflow: hidden;
}
.ripple:after {
content: "";
display: block;
position: absolute;
width: 100%;
height: 100%;
top: 0;
left: 0;
pointer-events: none;
background-image: radial-gradient(circle, #666 10%, transparent 10.01%);
background-repeat: no-repeat;
background-position: 50%;
transform: scale(10, 10);
opacity: 0;
transition: transform .3s, opacity .5s;
}
.ripple:active:after {
transform: scale(0, 0);
opacity: .3;
transition: 0s;
</style>
</head>
<body>
<div class="container text-center">
<button class="btn btn-default ripple btn-lg">Button</button>
<button class="btn btn-default ripple btn-lg">Button with very long content</button>
</div>
</body>
</html>
