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

class Application extends StatelessWidget {
  const Application({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: YourScreen(),
    );
  }
}
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