.thumbnail.card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    border-radius: 0 0 10px 10px;
    padding: 15px;
}
.thumbnail.card > .caption {
    flex-grow: 1;
    padding-top: 0;
}
.thumbnail.card > :last-child {
    margin-bottom: 0;
}