Managed to make this container but not able to create this orange button stacked up on both the widgets

Question

    Widget Card(String title, String cityName, int price, String location,
    String imagePath) {
  return Column(children: [
    Positioned(
      child: Container(
        width: Get.width,
        height: 160,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.only(
            topLeft: Radius.circular(6),
            topRight: Radius.circular(6),
          ),
          image: DecorationImage(
            fit: BoxFit.cover,
            alignment: Alignment.topCenter,
            image: AssetImage(
              imagePath,
            ),
          ),
        ),
      ),
    ),
    Stack(children: [
      Container(
        width: Get.width,
        height: 140,
        decoration: BoxDecoration(
          color: Colors.white,
          borderRadius: BorderRadius.only(
            bottomRight: Radius.circular(6),
            bottomLeft: Radius.circular(6),
          ),
        ),
        child: Padding(
          padding: const EdgeInsets.only(left: 15),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              SizedBox(
                height: 18,
              ),
              Text(
                title,
                style: TextStyle(
                    color: Colors.black,
                    fontFamily: "PoppinsMedium",
                    fontSize: 14),
              ),
              Text(
                cityName,
                style: TextStyle(
                  color: Colors.black,
                  fontFamily: "PoppinsMedium",
                  fontSize: 14,
                ),
              ),
              SizedBox(
                height: 8,
              ),
              Row(
                children: [
                  Text(
                    'GHC $price',
                    style: TextStyle(
                        color: Color(0xFF2E3034),
                        fontFamily: "PoppinsBold",
                        fontSize: 20),
                  ),
                  Text(
                    '/ month',
                    style: TextStyle(
                      color: Color(0xFF2E3034),
                      fontFamily: "PoppinsMedium",
                      fontSize: 12,
                    ),
                  ),
                ],
              ),
              Row(
                children: [
                  Icon(
                    Icons.location_on_outlined,
                    size: 12,
                    color: Color(0xFF8F92A1),
                  ),
                  SizedBox(
                    width: 5,
                  ),
                  Text(
                    location,
                    style: TextStyle(
                      color: Color(0xFF8F92A1),
                      fontFamily: "PoppinsMedium",
                      fontSize: 12,
                    ),
                  )
                ],
              )
            ],
          ),
        ),
      ),
    ]),
  ]);
}