.photos {
    padding: 0;
    margin: 0;
    list-style: none;
    display: flex;
    flex-flow: row wrap;
}

.photos__cell {
    margin: 4px;
    flex: 0 256px;
}

.photo {
    width: 100%;
}

.photo-caption {
    margin-top: 1em;
}