MaterialApp(
    home: StreamBuilder(
    stream: FirebaseAuth.instance.authStateChanges(),
    builder: (context, snapshot) {
      if (snapshot.connectionState == ConnectionState.waiting) {return Center(child: CircularProgressIndicator(color: Colors.white,));} 
      else if (snapshot.hasError) {return showSnackBar(context, "Something went wrong");}
      else if (snapshot.hasData) {return Home();}
      else { return Login();}
    },
 ),
 ),