[Projeto] Resolução do desafio

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: Container(
        color: Colors.black,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Column(),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.red,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.orange,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.yellow,
                )
              ],
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.green,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.blueAccent,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.blue,
                )
              ],
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.spaceAround,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.purple,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.pinkAccent,
                ),
                Container(
                  width: 100,
                  height: 100,
                  color: Colors.white,
                )
              ],
            )
          ],
        ),
      ),
    );
  }
}