a {
    transition: 0.25s all;
}

.card {
    overflow: hidden;
    box-shadow: 0 2px 5px 0 rgba(0, 0, 0, .16), 0 2px 10px 0 rgba(0, 0, 0, .12);
    transition: 0.25s box-shadow;
}

.card:focus,
.card:hover {
    box-shadow: 0 5px 11px 0 rgba(0, 0, 0, .18), 0 4px 15px 0 rgba(0, 0, 0, .15);
}

.card-inverse .card-img-overlay {
    background-color: rgba(51, 51, 51, .85);
    border-color: rgba(51, 51, 51, .85);
}