images not taking full width in carousel – Flutter

i created a carousel containing three different images. the problem is these images are not taking the full length of my current screen. i have tried setting the width in the image and even setting the aspect ratio and viewport in carousel options but the outcome is still the same. help would be very much appreciated. here is the code.

 final List<Widget> _images = [
    Stack(
      children: [
        Image.asset('assets/images/image 10.png'),
        Padding(
          padding: const EdgeInsets.only(left: 55.0, top: 230),
          child: Text(
            'Luxury n   Fashion n &Accessories'.toUpperCase(),
            style: TextStyle(
                fontFamily: 'Bodoni',
                fontSize: 40,
                fontWeight: FontWeight.w500,
                color: Colors.grey.shade700
            ),
          ),
        ),
        Padding(
          padding: const EdgeInsets.only(top: 400.0),
          child: Center(
            child:SvgPicture.asset('assets/iconImages/Button.svg'),
          ),
        ),
      ],
    ),
    Image.asset('assets/images/leeloo.jpeg', width: double.infinity,),
    Image.asset('assets/images/ayaka.jpeg', width: double.infinity,),
  ];

  @override
  Widget build(BuildContext context) {
    return  DefaultTabController(
              length: 5,
              child: Column(
                children: [
                  Stack(
                    children: [
                      CarouselSlider.builder(
                        options: CarouselOptions(
                            viewportFraction: 1,
                            aspectRatio: 16/9,
                            height: MediaQuery.of(context).size.height*0.78,
                            autoPlay: false,
                            initialPage: 0,
                            enableInfiniteScroll: false,
                            enlargeCenterPage: true,
                            onPageChanged: (index, reason){
                              setState(() {
                                _activeIndex = index;
                              });
                            }
                        ),
                        itemCount: _images.length,
                        itemBuilder: (BuildContext context, int index, int realIndex) {
                          return GestureDetector(
                              onTap: (){
                                Navigator.of(context).pushNamedAndRemoveUntil(BlackScreen.routeName, (route) => false);
                              },
                              child: Align(
                                alignment: Alignment.bottomCenter,
                                    child:Container(
                                        child: _images[index]
                                    ),
                              ),
                          );
                        },
                      ),