道理很简单，就是通过几个元素阴影叠加，生成我们看到的这种效果，主要是对阴影样式的运用，以及 before 和 after 元素的运用，直接上代码：
html 代码：
<!DOCTYPE html><html lang="en"><head> <meta charset="UTF-8"> <title>CSS3实现曲线阴影和翘边阴影</title> <link rel="stylesheet" type="text/css" href="css/style.css"></head><body> <div class="wrap effect"> <h1>shadow effect</h1> </div></body></html>
css 样式代码：
/* **author:青天诀; */body,h1,ul,li{ margin: 0; padding: 0; }body{ font-family: Arial; font-size: 20px; }ul,li{ list-style: none; }.wrap{ width: 50%; height: 200px; background-color: #fff; margin: 50px auto; position: relative; }.wrap h1{ line-height: 200px; text-align: center; font-size: 20px; }.effect{ -webkit-box-shadow: 0px 1px 4px rgba(0,0,0,.3), 0px 0px 40px rgba(0,0,0,.1) inset; -moz-box-shadow: 0px 1px 4px rgba(0,0,0,.3), 0px 0px 40px rgba(0,0,0,.1) inset; -o-box-shadow: 0px 1px 4px rgba(0,0,0,.3), 0px 0px 40px rgba(0,0,0,.1) inset; -mz-box-shadow: 0px 1px 4px rgba(0,0,0,.3), 0px 0px 40px rgba(0,0,0,.1) inset; box-shadow: 0px 1px 4px rgba(0,0,0,.3), 0px 0px 40px rgba(0,0,0,.1) inset; }.effect:before, .effect:after{ content: ""; background-color: red; position: absolute; z-index: -1; left: 10px; right: 10px; top: 50%; bottom: 0px; -webkit-box-shadow: 0px 0px 20px rgba(0,0,0,.8); -moz-box-shadow: 0px 0px 20px rgba(0,0,0,.8); -o-box-shadow: 0px 0px 20px rgba(0,0,0,.8); -mz-box-shadow: 0px 0px 20px rgba(0,0,0,.8); box-shadow: 0px 0px 20px rgba(0,0,0,.8); border-radius: 50px; }
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