<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style type="text/css">
div{
width:300px;
height:300px;
border:solid 1px red;
border-top-left-radius:20px;
border-top-right-radius:30px;
border-bottom-left-radius:30px;
border-bottom-right-radius:40px;
box-shadow:10px 10px 10px yellow;
}
</style>
</head>
<body>
<div></div>
</body>
</html>