Grid view builder not expanding by using Expanded widget in Flutter

///grid view builder, In this section I want to expand the grid view height as the available space for different size of phone height increase and other items height remains fixed but Expanded widget isn’t working, making whole ui blank. Please suggest me how I can make my grid view expandable as the height vary. Thanks in advance. Please see my whole code below in which I am using. I tried multiple solutions but didn’t worked.

1. Drawer

2. AppBar

3. Body – Slider, List-View, Grid-View

4. BottomNavigationBar

    @override
      Widget build(BuildContext context) {
       Size size = MediaQuery.of(context).size;
       return Scaffold(
          drawer: DrawerMenu(),
          appBar: PostHomeAppBar(appBar: AppBar()),
          body: Stack(
           children: [
            Container(
             height: double.infinity,
             width: double.infinity,
             decoration: const BoxDecoration(
            image: DecorationImage(
                image: AssetImage("lib/assets/asset/bg-original (1).png"),
                fit: BoxFit.cover)),
             child: Column(
              children: [
               Column(
                children: [
                ///slider
                Container(
                  height: size.height * 0.25,
                  width: double.infinity,
                  child: MySlider(),
                ),
   
                const SizedBox(
                  height: 5,
                ),
   
                ///list view builder
                Container(
                  height: 55,
                  child: ListView.builder(
                      scrollDirection: Axis.horizontal,
                      itemCount: _homePageController
                              .getGameCategorylist?.data?.length ??
                          0,
                      itemBuilder: (BuildContext context, int index) {
                        bool isSelected = _selectedTabIndex == index;
                        return Obx(
                          () => (_homePageController.isLoading.value)
                              ? const Center(child: Loader())
                              : _homePageController
                                          .getGameCategorylist!.data ==
                                      null
                                  ? const Center(
                                      child: Text(''),
                                    )
                                  : Padding(
                                      padding: const EdgeInsets.only(
                                          left: 2,
                                          right: 2,
                                          top: 4,
                                          bottom: 8),
                                      child: GestureDetector(
                                        onTap: () {
                                          _onTappedItem(index);
                                        },
                                        child: FittedBox(
                                          child: Container(
                                            padding: const EdgeInsets.only(
                                                left: 10, right: 10),
                                            decoration: BoxDecoration(
                                              color: isSelected
                                                  ? AppColors.golden
                                                  : null,
                                              gradient: isSelected
                                                  ? null
                                                  : const LinearGradient(
                                                      colors: [
                                                        Color(0xff1e1b53),
                                                        Color(0xff444185)
                                                      ],
                                                      begin: Alignment
                                                          .topCenter,
                                                      end: Alignment
                                                          .bottomCenter,
                                                    ),
                                              borderRadius:
                                                  BorderRadius.circular(30),
                                            ),
                                            child: Column(children: [
                                              SizedBox(
                                                height: size.height * 0.01,
                                              ),
                                              Text(
                                                _homePageController
                                                    .getGameCategorylist!
                                                    .data![index]
                                                    .lobbyCat
                                                    .toString(),
                                                textAlign: TextAlign.center,
                                                style: const TextStyle(
                                                    fontWeight:
                                                        FontWeight.w400,
                                                    color: Colors.white,
                                                    fontFamily: 'Roboto',
                                                    fontSize: 8),
                                              ),
                                              Text(
                                                '(${_homePageController.getGameCategorylist!.data![index].length.toString()})',
                                                textAlign: TextAlign.center,
                                                style: const TextStyle(
                                                    fontWeight:
                                                        FontWeight.w400,
                                                    color: Colors.white,
                                                    fontFamily: 'Roboto',
                                                    fontSize: 8),
                                              ),
                                              SizedBox(
                                                height: size.height * 0.005,
                                              ),
                                            ]),
                                          ),
                                        ),
                                      ),
                                    ),
                        );
                      }),
                ),
   
                ///grid view builder
                Expanded(
                  child: GridView.builder(
                    padding: EdgeInsets.zero,
                    gridDelegate:
                        const SliverGridDelegateWithFixedCrossAxisCount(
                      crossAxisCount: 2,
                      crossAxisSpacing: 2,
                      mainAxisSpacing: 2,
                      mainAxisExtent: 120,
                    ),
                    itemCount: casinoGameList?.data?.length ?? 0,
                    itemBuilder: (BuildContext context, int index) {
                      return Obx(() => (_homePageController.isLoading.value)
                          ? const Center(child: Loader())
                          : casinoGameList?.data == null
                              ? const Center(
                                  child: Text(''),
                                )
                              : GestureDetector(
                                  onTap: () {
                                    final gameData =
                                        casinoGameList?.data?[index];
                                    Get.to(() =>
                                        WebViewHome(gameData ?? Datum()));
                                  },
                                  child: Padding(
                                    padding: const EdgeInsets.all(4.0),
                                    child: Container(
                                      alignment: Alignment.center,
                                      decoration: BoxDecoration(
                                        borderRadius:
                                            BorderRadius.circular(10),
                                        image: DecorationImage(
                                          image: NetworkImage(base +
                                              '${casinoGameList?.data?[index].imgSrc.toString()}'),
                                          fit: BoxFit.cover,
                                        ),
                                      ),
                                    ),
                                  ),
                                ));
                    },
                  ),
                ),
              ],
            ),
          ],
        ),
      ),
      if (_isLoading)
        Padding(
          padding: EdgeInsets.only(top: 200),
          child: const Positioned.fill(
            child: Loader(),
          ),
        ),
     ],
     ),
     bottomNavigationBar: BottomNavigationBar(
      backgroundColor: const Color(0xff140b36),
      currentIndex: _currentIndex,
      onTap: (int index) {
      setState(() {
        _currentIndex = index;
      });
    },
    selectedItemColor: Colors.amber,
    unselectedItemColor: Colors.grey,
    type: BottomNavigationBarType.fixed,
    items: [
      BottomNavigationBarItem(
        icon: GestureDetector(
          onTap: () {
            Get.to(() => Home_Post_Login());
          },
          child: Image.asset('lib/assets/asset/icon_home_fill.png',
              color: _currentIndex == 0 ? Colors.amber : Colors.white,
              height: 20),
        ),
        label: 'HOME',
      ),
      BottomNavigationBarItem(
        icon: GestureDetector(
          onTap: () {
            Get.to(() => Login_Screen());
          },
          child: Image.asset('lib/assets/asset/icon_games.png',
              color: _currentIndex == 1 ? Colors.amber : Colors.white,
              height: 20),
        ),
        label: 'PROVIDERS',
      ),
      BottomNavigationBarItem(
        icon: GestureDetector(
          onTap: () {
            Get.to(() => WebViewHome(Datum(gameTypeUnified: 'game_shows')));
          },
          child: Image.asset('lib/assets/asset/icon_game_show.png',
              color: _currentIndex == 2 ? Colors.amber : Colors.white,
              height: 20),
        ),
        label: 'GAME SHOWS',
      ),
      BottomNavigationBarItem(
        icon: GestureDetector(
          onTap: () {
            Get.to(() => Profile());
          },
          child: Image.asset('lib/assets/asset/icon_user.png',
              color: _currentIndex == 3 ? Colors.amber : Colors.white,
              height: 20),
        ),
        label: 'MY ACCOUNT',
      ),
     ],
     ),
    );
   }