.excludedCard {
    filter: grayscale(100%);
}

.fullCard {
    width: 294px;
    height: 408px;
}

.card {
    width: 294px;
    height: 408px;
    position: relative;
    display: inline-block;
}
.card .img-top {
    display: none;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 99;
}
.card:hover .img-top {
    display: inline;
}