ProgressButton.Dart

              child: new MaterialButton(
                child: setUpButtonChild(),
                onPressed: () {
                  setState(() {
                    if (_state == 0) {
                      animateButton();
                    }
                  });
                },
                elevation: 4.0,
                minWidth: double.infinity,
                height: 48.0,
                color: Colors.lightGreen,
              ),