showDialog(
      context: context,
      builder: (context) {
        return AlertDialog(
          title: const Text('이메일을 입력하세요'),
          content: Column(
            mainAxisSize: MainAxisSize.min,
            children: [
              Text(
                'If you are an AppStore reviewer, CHECK the note for reviewers in AppStore. There is guide to sign-in.',
                style: TextStyle(
                  fontSize: 12.sp,
                ),
              ),
              TextField(
                keyboardType: TextInputType.multiline,
                textInputAction: TextInputAction.unspecified,
                autocorrect: false,
                onChanged: (value) {
                  setState(() {
                    valueText = value;
                  });
                },
                controller: _textFieldController,
              ),
            ],
          ),
          actions: <Widget>[
            TextButton(
              child: const Text('CANCEL'),
              onPressed: () {
                setState(() {
                  Navigator.pop(context);
                });
              },
            ),
            TextButton(
              child: const Text('OK'),
              onPressed: () {
                setState(() {
                  Navigator.of(context).pop(valueText);
                });
              },
            ),
          ],
        );
      },
    );

    return FlutterWebFrame(
      builder: (context) {
        return ScreenUtilInit(
          useInheritedMediaQuery: true,
          designSize: const Size(375, 820),
          builder: (BuildContext context, Widget? child) {
            return MaterialApp(
              ...
              theme: ThemeData(
                primaryColor: ColorSet.doplePurple,
                fontFamily: 'Pretendard',
                appBarTheme: AppBarTheme(
                  systemOverlayStyle: SystemUiOverlayStyle.dark,
                  color: ColorSet.doplePurple,
                  surfaceTintColor: Colors.white,
                  elevation: 0.0,
                  titleTextStyle: TextStyle(
                    fontWeight: FontWeight.bold,
                    fontSize: 16.sp,
                    height: 1.25,
                    fontFamily: 'Pretendard',
                  ),
                ),
                bottomNavigationBarTheme: const BottomNavigationBarThemeData(
                  selectedItemColor: ColorSet.doplePurple,
                  unselectedItemColor: ColorSet.idleGrey,
                  backgroundColor: Colors.white,
                ),
                bottomAppBarTheme: const BottomAppBarTheme(
                  color: ColorSet.doplePurple,
                  surfaceTintColor: Colors.white,
                ),
                textTheme: const TextTheme(
                  bodyMedium: TextStyle(
                    color: ColorSet.alphaGrey4D4D4D,
                  ),
                  labelLarge: TextStyle(
                    color: ColorSet.caption,
                  ),
                ),
                colorScheme: ThemeData().colorScheme.copyWith(
                      background: Colors.white,
                    ),
                dialogBackgroundColor: Colors.white,
                bottomSheetTheme: const BottomSheetThemeData(
                  backgroundColor: Colors.white,
                  modalBackgroundColor: Colors.white,
                  surfaceTintColor: Colors.white,
                ),
                floatingActionButtonTheme: const FloatingActionButtonThemeData(
                  shape: CircleBorder(),
                ),
              ),
              ...
            );
          },
        );
      },
      maximumSize: const Size(375, 820),
      enabled: kIsWeb,
    );