u2_a2

main.dart

import 'package:flutter/material.dart';



void main() => runApp(MyApp());



class MyApp extends StatelessWidget {

  @override

  Widget build(BuildContext context) {

    return MaterialApp(

        home: Scaffold(

          body: Row(

            crossAxisAlignment: CrossAxisAlignment.center,

            mainAxisAlignment: MainAxisAlignment.spaceEvenly,

            children: <Widget>[

              Flexible(

                child: Container(color: Colors.blue, height: 100, width: 100),

              ),

              Flexible(

                child: Container(color: Colors.red, height: 200),

              ),

              Flexible(

                child: Container(color: Colors.amber, height: 100,),

              )

            ],

          ),

        ));

  }