1. CSS Flexible Box Layout Module

    Method of positioning elements in horizontal or vertical stacks. Support includes all properties prefixed with `flex`, as well as `display: flex`, `display: inline-flex`, `align-content`, `align-items`, `align-self`, `justify-content` and `order`.

  2. css property: flex-direction

  3. css property: flex-direction: column

  4. css property: flex-direction: column-reverse

  5. css property: flex-direction: row

  6. css property: flex-direction: row-reverse