Stack(
                  fit: StackFit.expand,
                  children: <Widget>[
                    Positioned(
                      child: Icon(
                        Icons.touch_app,
                        color: Colors.blueAccent,
                      ),
                      right: 110.0,
                      bottom: 300.0,
                    ),
                    GestureDetector(
                      child: Chart(occData),
                      onTap: _setDetailedView,
                    ),
                  ],
                )