.row-of-images-with-captions h4 {
    margin-top: 1em;
}

.row-of-images-with-captions .small-12 ~ .small-12 {
    margin-top: 2em;
}
@media print, screen and (min-width: 768px) {
    .row-of-images-with-captions .small-12 ~ .small-12 {
        margin-top: 0;
    }
}