Need change dark mode theme about getx HOT 6 OPEN

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

  @override
  Widget build(BuildContext context) {
    return GetBuilder(
        init: MainController(),
        builder: (_) {
          return GetMaterialApp(
            title: "Lestaripedia",
            theme: ThemeData(
              colorScheme: ColorScheme.fromSeed(
                seedColor: Colors.green,
                brightness: Brightness.light,
              ),
              useMaterial3: true,
            ),
            darkTheme: ThemeData(
              colorScheme: ColorScheme.fromSeed(
                seedColor: Colors.green,
                brightness: Brightness.dark,
              ),
              useMaterial3: true,
            ),
            themeMode: _.isDarkMode.value ? ThemeMode.dark : ThemeMode.light,
            home: const LoginUi(),
          );
        });
  }
}