How to set a certain block to be fixed in css

How to set a certain div to be fixed in css: first create an HTML sample file; then define a div in the body; finally set the div to be fixed through attributes such as "position: fixed;".

The operating environment of this article: Windows7 system, HTML5&&CSS3 version, DELL G3 computer

css controls a certain div to be fixed

The most common way to fix it is to position it.

But you need to pay attention when positioning:

① If you want to fix it somewhere on the screen, then make sure the parent element of the fixed element is body;

② is Fixed elements set width and height.

For example, add the following code to your footer class:

If the top is fixed

[Recommended learning:css video tutorial]

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