.card {

            width: 200px;

            height: 195px;

            position: relative;

            display: inline-block;

        }

        .card .img-top {

            display: none;

            position: absolute;

            top: 0;

            left: 0;
           
            z-index: 99;
            width:200px;
        }

        .card:hover .img-top {

            display: inline;

        }
		

.img1  {
  display: none;
}
.img1.show {
  display: block;
}
.img2  {
  display: none;
}
.img2.show {
  display: block;
}
.img3  {
  display: none;
}
.img3.show {
  display: block;
}
.img4  {
  display: none;
}
.img4.show {
  display: block;
}