The
crossAxisAlignment and
mainAxisAlignment are used to control how a row and column widget aligns with their children depending on our choice.
As Children of the Row Widget are arranged horizontally.
For Row :
* mainAxisAlignment = Horizontal Axis
* crossAxisAlignment = Vertical Axis
As Children of the Column Widget are arranged vertically.
For Column :
* mainAxisAlignment = Vertical Axis
* crossAxisAlignment = Horizontal Axis
