ThemeData lightTheme = ThemeData.dark().copyWith(
    textTheme: ThemeData.dark().textTheme.apply(
          fontFamily: 'RobotoMono',
        ),
    primaryTextTheme: ThemeData.dark().textTheme.apply(
          fontFamily: 'RobotoMono',
        ),
    accentTextTheme: ThemeData.dark().textTheme.apply(
          fontFamily: 'RobotoMono',
        ),
);