anchor.diff:    AuthManager() {
       // Starts the game
       _loginButton = querySelector('#login-button');
  -    _personaNavigator = new Persona('', verifyWithServer, _logout);
  +    _personaNavigator = new Persona('', verifyWithServer, view.loggedOut);
       _loginButton.onClick.listen((_) {
         _personaNavigator.request({
           'backgroundColor': '#4b2e4c',
           'siteName': 'Children of Ur'
         });
  +      _loginButton.hidden = true;
       });
     }
   
     void verifyWithServer(String personaAssertion) {
  +    _loginButton.hidden = true;
       HttpRequest.request(_authUrl + "/login", method: "POST", requestHeaders: {
         "content-type": "application/json"
       }, sendData: JSON.encode({
  
positive.code:       _personaNavigator.logout();
        window.location.reload();
    }
    void _logout() {
      if (CurrentPlayer != null)
        CurrentPlayer.remove();
      view.loggedOut();
    }
  
  }
  
negative.code: 
        if (serverdata['ok'] == 'no') {
          print('Error:Server refused the login attempt.');
          _loginButton.hidden = false;
          return;
        }
  
  