Open lib/main.dart and replace its full contents with:

    
 import 'package:css_colors/css_colors.dart';
 import 'package:flutter/material.dart';

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

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

   @override
   Widget build(BuildContext context) {
     return const MaterialApp(
       home: DemoPage(),
     );
   }
 }

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

   @override
   Widget build(BuildContext context) {
     return Scaffold(body: Container(color: CSSColors.orange));
   }
 }

Run the app. The app’s background should now be orange.

Example: Using the url_launcher package to launch the browser