How can a vertical menu area move all other elements, also fixed and cross browser

How to make a menu like this, where the menu moves the whole site?

I tried by putting all in a parent div, but got problems with fixed elements, like for top section

Any hints here?

Here is my public share link: LINK
(how to access public share link)

Here is a test link so far.

The fixed element is not working, as it should.

Any help would be great.

Solved this so far, myself

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