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业精于勤，荒于嬉;行成于思，毁于随。
Yours looks like it uses css transparent background effect
background-color: rgba(0, 0, 0, 0.9);
box-shadow can be achieved.
Make two mask layers
box-shadow property will do the trick.
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
Yours looks like it uses css transparent background effect
box-shadow can be achieved.
Make two mask layers
box-shadow property will do the trick.