[Dúvida] Retorno de Widget

Boa noite.
Eu queria mostrar um pouco o meu código que eu fiz, sei que ainda da para melhorar, mas fiz o que eu consegui absorver.

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(
title: 'Flutter Demo',
theme: ThemeData(
colorScheme: ColorScheme.fromSeed(
seedColor: const Color.fromARGB(255, 104, 30, 233)),
useMaterial3: true,
),
home: const MyHomePage(title: 'Flutter Primeiros Passos'),
);
}
}

class MyHomePage extends StatefulWidget {
const MyHomePage({super.key, required this.title});

final String title;

@override
State createState() => _MyHomePageState();
}

class _MyHomePageState extends State {
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
appBar: AppBar(
backgroundColor: Theme.of(context).colorScheme.inversePrimary,
title: Text(widget.title),
),
body: Container(
child: ListView(
children: [
Flag(
Colors.white,
Colors.pinkAccent,
Colors.lightBlueAccent,
100,
Icons.people,
),
Flag(
Colors.pink,
Colors.purple,
Colors.blueAccent,
100,
Icons.people,
),
Flag(
Colors.pinkAccent,
Colors.amber,
Colors.lightBlue,
100,
Icons.people,
),
Flag(
Colors.purpleAccent,
Colors.white,
Colors.green,
100,
Icons.people,
),
],
),
),
);
}
}

class Flag extends StatelessWidget {
const Flag(this.cor1, this.cor2, this.cor3, this.largura, this.icon,
{super.key});

final Color cor1;
final Color cor2;
final Color cor3;
final double largura;
final IconData icon;

@override
Widget build(BuildContext context) {
return Padding(
padding: const EdgeInsets.all(8.0),
child: Row(
children: [
Container(
height: 140,
width: largura,
decoration: BoxDecoration(
color: cor1,
borderRadius: BorderRadius.circular(20),
border: Border.all(color: Colors.black, width: 3),
),
),
Container(
height: 140,
width: largura,
decoration: BoxDecoration(
color: cor2,
borderRadius: BorderRadius.circular(20),
border: Border.all(color: Colors.black, width: 3),
),
child: Icon(icon),
),
Container(
height: 140,
width: largura,
decoration: BoxDecoration(
color: cor3,
borderRadius: BorderRadius.circular(20),
border: Border.all(color: Colors.black, width: 3),
),
),
],
),
);
}
}