New File

main.dart

+import 'package:bot_toast/bot_toast.dart';
+import 'package:detector/presentation/screens/login/login_screen.dart';
+import 'package:firebase_core/firebase_core.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_screenutil/flutter_screenutil.dart';
+import 'package:google_fonts/google_fonts.dart';
+import 'package:pedantic/pedantic.dart';
+import 'package:provider/provider.dart';
+
+import 'data/provider/data_provider.dart';
+import 'data/provider/ui_support_provider.dart';
+import 'presentation/themes/color_theme.dart';
+
+void main() async {
+  WidgetsFlutterBinding.ensureInitialized();
+  await Firebase.initializeApp();
+  unawaited(
+      SystemChrome.setPreferredOrientations([DeviceOrientation.portraitUp]));
+  runApp(MyApp());
+}
+
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return ScreenUtilInit(
+      designSize: Size(414, 896),
+      builder: () {
+        return MultiProvider(
+          providers: [
+            ChangeNotifierProvider<DataProvider>(
+              create: (_) => DataProvider(),
+            ),
+            ChangeNotifierProvider<UiSupportProvider>(
+              create: (_) => UiSupportProvider(),
+            ),
+          ],
+          child: MaterialApp(
+            debugShowCheckedModeBanner: false,
+            title: "Depression Detector",
+            theme: ThemeData(
+              textTheme: GoogleFonts.firaSansTextTheme(
+                Theme.of(context).textTheme,
+              ),
+              scaffoldBackgroundColor: ColorTheme.backgroundColor,
+              primaryColor: ColorTheme.accentColor1,
+            ),
+            builder: BotToastInit(),
+            navigatorObservers: [BotToastNavigatorObserver()],
+            home: LoginScreen(),
+          ),
+        );
+      },
+    );
+  }
+}