1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
   | class DemoColumn extends StatelessWidget {   const DemoColumn({Key? key}) : super(key: key);
    @override   Widget build(BuildContext context) {     return Column(       mainAxisAlignment: MainAxisAlignment.center,       crossAxisAlignment: CrossAxisAlignment.center,       children: [         Container(           width: 50,           height: 50,           color: Colors.amber,         ),         Container(           width: 50,           height: 50,           color: Colors.redAccent,         ),         Container(           width: 50,           height: 50,           color: Colors.blueAccent,         ),         Container(           width: 50,           height: 50,           color: Colors.cyanAccent,         ),         Container(           width: 50,           height: 50,           color: Colors.limeAccent,         ),       ],     );   } }
 
  |