AnimatedContainerUI.dart

 @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Stack(
        children: [
          Image.asset(
            "assets/images/area.jpg",
            fit: BoxFit.cover,
            height: double.infinity,
            width: double.infinity,
          ),
          Positioned(
            bottom: 0,
            left: 0,
            right: 0,
            child: Column(
              children: [
                Transform.translate(
                  offset: Offset(0, _animation.value),
                  child: Image.asset(
                    "assets/images/basketball.png",
                    height: 70,
                    width: 70,
                    fit: BoxFit.contain,
                  ),
                ),
                GestureDetector(
                  onTap: () {},
                  child: Container(
                    height: 20,
                    width:  60,
                    decoration: BoxDecoration(
                      color:  Colors.blueGrey,
                      borderRadius: const BorderRadius.all(
                              Radius.circular(0),
                            ),
                      border: Border.all(
                        color:  Colors.teal,
                        width:  2,
                      ),
                    ),
                  ),
                ),
              ],
            ),
          )
        ],
      ),
    );