img {
    user-select: none;
}

.center {
    position: absolute;
    height: 50%;
    width: 50%;
    top: 50%;
    left: 50%;
    translate-top: -50%;
    translate-left: -50%;
    transform: translate(-50%, -50%);
}

#cards {
    .col {
        overflow-y: auto;

        .card .card-header img {
            cursor: pointer;
        }

        .card .list-group {
            max-height: 33.3vh;
            overflow: auto;

            .list-group-item {
                text-overflow: ellipsis;
                white-space: nowrap;
                overflow: hidden;
            }
        }
    }
}