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

Flexbox Codrops

Flexbox - Webflow University Documentation

Flex Layout

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Some ways to align the last row in a flexbox grid

CSS Flexible Box Layout Module

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Flexbox - Learn web development