import 'package:flutter/material.dart';
void main()
{
  runApp(MyApp());
}
class MyApp extends StatelessWidget
{
  @override
    
  Widget build(BuildContext context)
  {
    return MaterialApp(
      home:Scaffold(
        appBar:AppBar(
          title:const Text("This is AppBar"), //AppBar section
        ),
        body:Container(
          height:400.0,
          color:Colors.pink,
          child:Column(
            children: [
              Container(
                  height:50.0,
                width:50.0,
                color:Colors.red,
                
              ),
              Container(
                  height:50.0,
                width:50.0,
                color:Colors.green,
                
              ),
           
            ],
          ),
        ),
      ),
    );

  }

}