import 'package:flutter/material.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      home: MyHomePage(),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key}) : super(key: key);

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

class _MyHomePageState extends State<MyHomePage> {
  @override
  Widget build(BuildContext context) {
    return Material(
      child: Center(
        child: ElevatedButton(
          child: Text('Forward', style: TextStyle(fontSize: 120.0)),
          onPressed: () {
            Navigator.push(context, MaterialPageRoute(
              builder: (BuildContext context) {
                return Material(
                  color: Colors.green,
                  child: Center(
                    child: ElevatedButton(
                      child: Text('Backward', style: TextStyle(fontSize: 120.0)),
                      onPressed: () {
                        Navigator.of(context).pop();
                      },
                    ),
                  ),
                );
              },
            ));
          },
        ),
      ),
    );
  }
}