flutter column align

mainAxisAlignment: MainAxisAlignment.center //Center Column contents vertically,

Row(  crossAxisAlignment: CrossAxisAlignment.start,  verticalDirection: VerticalDirection.down,  children: [    Text(      'Flutter',      style: TextStyle(        color: Colors.yellow,        fontSize: 30.0      ),    ),    Text(      'Flutter',      style: TextStyle(          color: Colors.blue,          fontSize: 20.0      ),    ),  ],);