Flex Quickly manage the layout, alignment, and sizing of grid columns, navigation, components, and more with a full suite of responsive flexbox utilities. For more complex implementations, custom CSS may be necessary. Enable flex behaviors Apply display utilities to create a flexbox container and transform direct children elements into flex items. Flex containers and items are able to be modified
![Flex](https://cdn-ak-scissors.b.st-hatena.com/image/square/86eded69ba4da5eaa9d0494fcedcd47253c46881/height=288;version=1;width=512/http%3A%2F%2Fgetbootstrap.com%2Fdocs%2F4.0%2Fassets%2Fbrand%2Fbootstrap-social.png)