<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>盒子阴影</title>
<style>
#box{
width: 100px;
height: 100px;
margin: 100px auto;
background-color: blue;
/*X偏移量 Y偏移量 阴影模糊距离 阴影距离 阴影颜色 */
box-shadow: 2px 2px 2px 10px red;
}
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>
