theme reference - bg color text color

 Widget build(BuildContext context) {

  return MaterialApp(
    theme: ThemeData(
        primaryColor: Color(0xFF0A0E21),
        scaffoldBackgroundColor: Color(0xFF0AE21),
        accentColor: Colors.purple,
        textTheme: TextTheme(
          body1: TextStyle(color: Color(0xFFFFFFFF)),
        )),
    home: InputPage(),
  );