main.dart

Container(
                decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(10),
                    color: Colors.blue),
                child: FlatButton(
                  onPressed: () {
                    setState(() {
                      pressed = true;
                      animationValue = animationValue + 10;
                    });
                  },
                  child: Text(
                    "Refresh",
                    style: TextStyle(fontSize: 25, color: Colors.white),
                  ),
                ),
              ),