main.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 ElevatedButton(child: Text("Press here"),onPressed:  ()=>showDialog(
                    context: context,
                    builder: (context) {
                      return AlertDialog(
                        backgroundColor: Color.fromRGBO(8, 19, 40, 1),
                        actions: [
                          TextButton(
                              onPressed: () {
                                print('No');
                                Navigator.of(context).pop();
                              },
                              child: Text(
                                'No',
                                style: TextStyle(color: Colors.red),
                              )),
                          TextButton(
                              onPressed: () async {
                               print("Yes");

                                Navigator.of(context).pop();
                              },
                              child: Text(
                                'Yes',
                                style: TextStyle(color: Colors.red),
                              )),
                        ],
                        content:Text("Choose a option")
                      );
                    }).then((val){
      print("closed");
    }));
  }
}