Opposite of Row is Column, which can display its children in a vertical array.
Column with 3 containers center using MainAxisAlignment.center
.

Column( mainAxisAlignment: MainAxisAlignment.center, children: [ Container( width: 120, height: 120, color: Colors.blue, ), Container( width: 120, height: 120, color: Colors.red, ), Container( width: 120, height: 120, color: Colors.green, ), ], )
Column with 3 containers spaced evenly using MainAxisAlignment.spaceBetween
.

Column( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: [ Container( width: double.infinity, height: 150, color: Colors.cyan, ), Container( width: double.infinity, height: 150, color: Colors.pink, ), Container( width: double.infinity, height: 150, color: Colors.orange, ), ], )