import 'package:flutter/material.dart';
void main() {
  runApp(bannerApp()); //MaterialApp
}
 MaterialApp bannerApp() {
  return MaterialApp(
    home: Scaffold(
    body: Center(
        child: Container(
        padding: const EdgeInsets.all(10),
        child: Banner(
          message: '50% discount',
          location: BannerLocation.topStart,
          child: Container(
            height: 200,
            width: 200,
            color: Colors.yellow,
            alignment: Alignment.center,
            child: const Text('All items'),
          ),
        ),
       ),
      ), 
     ),
  );
}