.card {
        width: 100%;
        height: auto;
        position: relative;
        display: inline-block;
        margin: 0px;
    }
    .card .img-top {
        display: none;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 99;
    }
    .card:hover .img-top {
        display: inline;
    }