Flex

Utilities for controlling how flex items both grow and shrink.

Class	CSS Output
`flex-auto`	`flex: auto;`
`flex-initial`	`flex: 0 auto;`
`flex-none`	`flex: none;`
`flex-1`	`flex: 1;`
`flex-2`	`flex: 2;`
`flex-[2]`	`flex: 2;`
`flex-[1_1_0%]`	`flex: 1 1 0%;`