Flex
Parent
display: flex
flex-direction: row | row-reverse | column | column-reverse
flex-wrap: nowrap | wrap | wrap-reverse
flex-flow: <flex-direction> || <flex-wrap>
justify-content: flex-start | flex-end | center | space-between | space-around
align-items: flex-start | flex-end | center | stretch | baseline (single row)
align-content: flex-start | flex-end | center | stretch | space-between | space-around (multi-row)
Children(flex-item)
order: <integer>
flex-grow: <number>(0 default)
flex-shrink: <number>(0 default)
flex-basis: <length> | auto (auto default)
flex: none || <flex-grow><flex-shrink><flex-basis>
align-self: auto | flex-start | flex-end | center | stretch | baseline
**notice:** `float`, `clear`, `vertical-align` are unavailable in flex item