@media (min-width: 576px) {
    .card-columns {
        -webkit-column-count: 3;
        -moz-column-count: 3;
        column-count: 3;
        -webkit-column-gap: 1.25rem;
        -moz-column-gap: 1.25rem;
        column-gap: 1.25rem;
        orphans: 1;
        widows: 1;
    }

    .card-columns .card {
        display: inline-block;
        width: 100%;
    }
}

@media (min-width: 992px) {
    .card-columns {
        -webkit-column-count: 4;
        -moz-column-count: 4;
        column-count: 4;
        -webkit-column-gap: 1.25rem;
        -moz-column-gap: 1.25rem;
        column-gap: 1.25rem;
        orphans: 1;
        widows: 1;
    }

    .card-columns .card {
        display: inline-block;
        width: 100%;
    }
}