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

CSS - two row flexbox layout - having one row's width be determined by the second row's - Stack Overflow

html - Make flex items stack next to each other - Stack Overflow

An Interactive Guide to Flexbox in CSS

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html - Flexbox: center horizontally and vertically - Stack Overflow

layout - CSS Flex grid - Same width for last item - Stack Overflow

html - Center objects (divs) vertically and horizontally with wrap without big gaps - Stack Overflow

A Complete Guide to Flexbox

How to center an element in CSS without adding a wrapper in HTML - Bejamas