[Projeto] o Widget contra ataca

Tentei replicar igualzinho, foi quaseeee kkkk

import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter: Primeiros Passos'),
          leading: const Icon(Icons.check_circle_outline_outlined),
        ),
        backgroundColor: Colors.blueGrey[200],
        body: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Column(
              mainAxisAlignment: MainAxisAlignment.center,
              children: [
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: [
                      Quadrado(Colors.white),
                      Quadrado(Colors.pinkAccent),
                      Quadrado(Colors.lightBlue),
                    ],
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: [
                      Quadrado(Colors.deepOrangeAccent),
                      Quadrado(Colors.purple),
                      Quadrado(Colors.blueGrey),
                    ],
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: [
                      Quadrado(Colors.pinkAccent),
                      Quadrado(Colors.amber),
                      Quadrado(Colors.blue),
                    ],
                  ),
                ),
                Padding(
                  padding: const EdgeInsets.all(8.0),
                  child: Row(
                    children: [
                      Quadrado(Colors.purple),
                      Quadrado(Colors.white),
                      Quadrado(Colors.green),
                    ],
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
    );
  }
}

class Quadrado extends StatelessWidget {
  final Color cor;
  const Quadrado(this.cor, {Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 80,
      height: 130,
      color: cor,
    );
  }
}