html - Flexbox column align items same width but centered without wrapper ( css-only) - Stack Overflow

This is for a mobile menu, which of course needs to be responsive. The longest child should set the width for all the other children .index needs to be full width and height with a background-color

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html - Flexbox width of header aligned with outer part of content - Stack Overflow

A Guide to CSS Flexbox - CoderPad

How to align an element to bottom with flexbox in CSS ? - GeeksforGeeks

Some ways to align the last row in a flexbox grid

html - How to make the buttons equally aligned and of the same width? - Stack Overflow