How to make the menu full screen height?

Question

css

Actually the question is about what to position it, what properties to set for the parent and the menu itself?
Now the menu is located in the header block, which has a fixed height, so there can be no question of any height in the entire width of the page. There is an option to make the element a child of the body, but I don’t know how correct this decision will be.

Answer 1

give the following css for the menu block:

position: fixed;
z-index: 999;
width: 100%;
height: 100%;

see what happens. Perhaps you can add more yourself.
I just offered as a starting point. The main thing is position: fixed; .