Widget RaisedButton

main.dart

import 'package:flutter/material.dart';

void main() => runApp(App());

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: HomePage(),
    );
  }
}

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Flutter Demo'),
      ),
      body: RaisedButton(
        child: Text('Tap Me'),
        onPressed: () {
          debugPrint('Button Tap Me tapped');
        },
      ),
    );
  }
}