JS_learn/css3.html at master · muzichen/JS_learn · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset=utf-8 />
<title>before、after</title>
<style>
.box h3{
  text-align:center;
  position:relative;
  top:80px;
}
.box {
  width:70%;
  height:200px;
  background:#FFF;
  margin:40px auto;
}

.effect{
  position:relative;
    -webkit-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
       -moz-box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
            box-shadow:0 1px 4px rgba(0, 0, 0, 0.3), 0 0 40px rgba(0, 0, 0, 0.1) inset;
}
.effect::before, .effect::after{
    content:"";
    position:absolute;
    z-index:-1;
    -webkit-box-shadow:0 0 20px rgba(0,0,0,0.8);
    -moz-box-shadow:0 0 20px rgba(0,0,0,0.8);
    box-shadow:0 0 20px rgba(0,0,0,0.8);
    top:50%;
    bottom:0;
    left:10px;
    right:10px;
    -moz-border-radius:100px / 10px;
    border-radius:100px / 10px;
}
</style>
</head>
<body>
  <div class="box effect">
  <h3>Shadow Effect </h3>
</div>
</body>
</html>