Everything starts from colours

main.dart

// imports and the main() function above
class WhatsAppClone extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'WhatsApp',
      theme: ThemeData(
        primaryColor: Color(0xff075e54),
        indicatorColor: Colors.white,
        primaryColorDark: Color(0xFF128C7E),
        primaryIconTheme: IconThemeData(
          color: Colors.white,
        ),
        textTheme: TextTheme(
          title: TextStyle(color: Colors.white),
        ),
      ),
      home: Home(),
      // closing tags below