diff --git a/add_to_app/fullscreen/flutter_module/lib/main.dart b/add_to_app/fullscreen/flutter_module/lib/main.dart
index 3cd02f09b..4615a8971 100644
--- a/add_to_app/fullscreen/flutter_module/lib/main.dart
+++ b/add_to_app/fullscreen/flutter_module/lib/main.dart
@@ -64,6 +64,7 @@ class MyApp extends StatelessWidget {
   Widget build(BuildContext context) {
     return MaterialApp(
       title: 'Flutter Module Title',
+      theme: ThemeData.light(useMaterial3: true),
       routes: {
         '/': (context) => const FullScreenView(),
         '/mini': (context) => const Contents(),