The following css style code is set, but the displayed height is not full screen, as shown in the figure.
.ss_hide{
position: fixed;
background: rgba(0,0,0,.2);
height: 100%;
width: 100%;
}
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Recommended to use in full screen
top: 0;
bottom: 0;
left: 0;
right: 0;
Check whether the size of your body and html are full screen. Or 100vh high and 100vw wide
Absolute positioning is out of the document flow, right? Since everything is absolutely positioned top:0;left:0;right:0;bottom:0; just covers the screen
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
