<!Doctype html>
<html>
<head>
<meta Charset="utf-8">
<title>shadow</title>
<style> type="text/css">
.outset{
width:200px;
height:200px;
box-shadow:10px 10px 6px #000;
}
</style>
</head>
<body>
<h2>out shadow</h2>
<div class="outset"></div>
</body>
</html>
///在浏览器里显示不出来效果，，，，
<style>旁边
<style type="text/css">