anchor.diff:      safeBlockVertical = (screenHeight - _safeAreaVertical) / 100;
     }
   }
  +
  
positive.code:             ),
              actions: <Widget>[
                FlatButton(
                    child: Icon(Icons.close),
                    onPressed: () {
                      Navigator.of(context).pop();
                    })
  
negative.code:                             color: Colors.black,
                              fontSize: ScalingUtility.safeBlockHorizontal * 4,
                              letterSpacing:
                              ScalingUtility.safeBlockHorizontal * 3),
                        )
                      ],
                    ),
  