main.dart

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      initialRoute: '/',
      routes: {
        // When navigating to the "/" route, build the FirstScreen widget.
        '/': (context) => const HomePage(),
        // When navigating to the "/second" route, build the SecondScreen widget.
        '/second': (context) => const Page2(),
      },
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Home page'),
      ),
      body: Center(
        child: Column(
          children: <Widget>[
            ElevatedButton(
              child: const Text('Simple transition'),
              onPressed: () {
                Navigator.of(context).pushNamed('/second');
              },
            ),
          ],
        ),
      ),
    );
  }
}

class Page2 extends StatelessWidget {
  const Page2({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: const Text('Page 2'),
        ),
        body: const Center(
            child: Text(
          'Page 2',
          style: TextStyle(fontSize: 30),
        )));
  }
}