清华大佬耗费三个月吐血整理的几百G的资源，免费分享！....>>>
<!DOCTYPE html>
<html>
<head>
<style>
.container {
position: absolute;
background-color: #dddddd;
width: 600px;
height: 200px;
overflow: hidden;
}
.shadow {
position: absolute;
left: 50px;
top: 50px;
width: 300px;
height: 100px;
background-color: yellow;
box-shadow: 0 0 0 500px rgba(0, 0, 0, 0.2);
;
}
</style>
</head>
<body>
<div class="container">
asdfasdfasdfasf
<div class="shadow"></div>
</div>
</body>
</html>