It is better to use FlexBox or Position for this layout?

I am trying to figure out what is the "right" mthod to use to create a certain layout. I attached a picture of what the desktop look for the layout would be. Basicly a sticky header, two columns but the right column has a footer under it. When it converts the mobile version the sticky header stays, the side bar gets hidden until a hambergure menu icon is clicked then it will slide out, the main content and footer will take up the whole width as normal.

Obviously the sticky header needs to be position call but would it be better to use a flexbox for the reset of the segmenting or should I do position calls? Thanks!
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