Error 404

import 'package:flutter/material.dart';

class Error404 extends StatelessWidget {
  const Error404({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: Padding(
          padding: const EdgeInsets.all(32),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                '404',
                style: Theme.of(context).textTheme.displayLarge?.copyWith(
                      fontWeight: FontWeight.bold,
                      color: Theme.of(context).colorScheme.primary,
                    ),
              ),
              const SizedBox(height: 16),
              Text(
                'Page not found',
                style: Theme.of(context).textTheme.headlineSmall,
              ),
              const SizedBox(height: 8),
              Text(
                'The page you\'re looking for doesn\'t exist or has been moved.',
                textAlign: TextAlign.center,
                style: Theme.of(context).textTheme.bodyLarge,
              ),
              const SizedBox(height: 32),
              FilledButton.icon(
                onPressed: () => _showDemo(context, 'Go Home (demo)'),
                icon: const Icon(Icons.home),
                label: const Text('Go Home'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}

void _showDemo(BuildContext context, String message) {
  ScaffoldMessenger.of(context)
    ..hideCurrentSnackBar()
    ..showSnackBar(SnackBar(content: Text(message)));
}