list_factor.dart

import 'package:flutter/material.dart';

final Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(scaffoldBackgroundColor: darkBlue),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView.builder(itemBuilder: (context, index) {
        return Align(
          heightFactor: 0.7,
          child: CircleAvatar(
              backgroundColor:
                  Colors.primaries[index % Colors.primaries.length],
              child: Text(index.toString())),
        );
      }),
    );
  }
}