@media (min-width: 544px) {
    .col-xsm-6 {
        width: 50%;
    }
}

@media (min-width: 768px) {
    .col-sm-6 {
        width: 50%;
    }
}

@media (min-width: 992px) {
    .col-md-4 {
        width: 33.33333333%;
    }
}

.card .thumbnail {
    position: relative;
    padding-bottom: 100%;
}

.thumbnail > a {
    bottom: 0;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    z-index: 1;
}

.thumbnail .caption {
    padding: 16px 20px;
    position: absolute;
    bottom: 0;
    width: 100%;
    background-color: rgba(0, 0, 0, .3);
}

@media (min-width: 768px) {
    .thumbnail .caption {
        padding: 16px 20px;
    }
}

.caption > h2,
.caption > h2 > a {
    color: #fff;
    margin-top: 0;
    margin-bottom: 0;
    font-size: 24px;
    font-weight: 300;
    text-decoration: none;
}

@media (min-width: 768px) {
    .caption > h2 {
        font-size: 30px;
    }
}