How to customize a date picker

Flutter 2.0.2

    showDatePicker(
      builder: (context, child) {
        return Theme(
          data: Theme.of(context).copyWith(
            colorScheme: ColorScheme.light(
              primary: Colors.yellow, // header background color
              onPrimary: Colors.black, // header text color
              onSurface: Colors.green, // body text color
            ),
            textButtonTheme: TextButtonThemeData(
              style: TextButton.styleFrom(
                foregroundColor: Colors.red, // button text color
              ),
            ),
          ),
          child: child!,
        );
      },
    );
  },
);