## Stacking

Stacking allows you to control the layout of a `<Box>`'s child components. Controlled with the `stacked`, `justify`, and `align` properties.

**stacked**: Legal values:
  * `row`: stack children horizontally
  * `column`: stack children vertically.

**justify**: Legal values:
  * `start`: anchor children to the left (`row`) or top (`column')
  * `end`: anchor children to the right (`row`) or bottom (`column')
  * `center`: center children horizontally (`row`) or vertically (`column`)
  * `space-between`: anchor outside children to the edges and distribute extra space between then.

**align**: Legal values:
  * `start`: anchor children to the top (`row`) or left (`column')
  * `end`: anchor children to the bottom (`row`) or right (`column')
  * `center`: center children vertically (`row`) or horizontally (`column`)
