import 'package:flutter/material.dart';

void main() => runApp(const ReproApp());

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

  @override
  Widget build(BuildContext context) {
    final ThemeData themeData = ThemeData(
      brightness: Brightness.dark,
      inputDecorationTheme: const InputDecorationTheme(
        labelStyle: TextStyle(color: Colors.red, fontWeight: FontWeight.bold),
      ),
    );

    return MaterialApp(
      theme: themeData,
      home: Scaffold(
        body: Padding(
          padding: const EdgeInsets.all(8.0),
          child: SizedBox(
            width: 250,
            child: InputDecorationTheme(
              data: const InputDecorationThemeData(
                labelStyle: TextStyle(color: Colors.green, fontWeight: FontWeight.bold),
              ),
              child: DropdownButtonFormField<String>(
                onChanged: (_) {},
                decoration: const InputDecoration(labelText: 'DropdownButtonFormField'),
                items: const [DropdownMenuItem(value: 'selected', child: Text('Selected item'))],
              ),
            ),
          ),
        ),
      ),
    );
  }
}