实现方案
首先定义一个有具体宽高的盒子，然后正确定位:after伪类。
效果
[图片上传中...(image.png-8e8e17-1593570486291-0)]
底部阴影
代码:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<style>
.box-shadow {
background-color: #FF8020;
width: 160px;
height: 90px;
position: relative;
}
.box-shadow:after {
content: "";
width: 150px;
height: 1px;
display: block;
position: absolute;
bottom: 0px;
left: 5px;
z-index: -1;
-webkit-box-shadow: 0px 0px 8px 2px #000000;
-moz-box-shadow: 0px 0px 8px 2px #000000;
box-shadow: 0px 0px 8px 2px #000000;
}
</style>
<body>
<div class="box-shadow"></div>
</body>
</html>
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