The Flexbox Layout (Flexible Box) cheat sheet module is a powerful layout module in CSS3, makes it easier to design flexible and fully responsive layout structure without using float or positioning. Directions and order in the container even when they are with dynamic or even unknown size.
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Usage examples of CSS Flexible Box Layout Module - Flexbox by Example. Understanding CSS Flexbox: Creating A Flexbox Container Item.
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The browser support for the Flexbox specification is:
Internet Explorer 11+
Safari 6.1+ (prefixed with -webkit-)
iOS 7.1+ (prefixed with -webkit-)
The flexbox properties are supported in all modern browsers.
You can see detailed browser support and compatibility here. https://caniuse.com/flexbox