#imagelightbox-caption {
    background-color: #666;
    bottom: 0;
    color: #fff;
    left: 0;
    padding: 10px;
    position: fixed;
    right: 0;
    text-align: center;
    z-index: 10001;
    animation: fade-in .25s linear;
}

@keyframes fade-in {
    0% {
        opacity: 0;
    }
    100% {
        opacity: 1;
    }
}