main.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Container(
        child: Column(
          mainAxisSize: MainAxisSize.max,
          children: [
            Expanded(
              child: Row(
                mainAxisSize: MainAxisSize.max,
                children: <Widget>[
                  Column(
                    mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                    children: <Widget>[
                      Container(
                        height: 42.0,
                        width: 42.0,
                        color: Colors.red,
                      ),
                      Container(
                        height: 42.0,
                        width: 42.0,
                        color: Colors.red,
                      ),
                      Container(
                        height: 42.0,
                        width: 42.0,
                        color: Colors.red,
                      ),
                      Container(
                        height: 42.0,
                        width: 42.0,
                        color: Colors.red,
                      ),
                    ],
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}