.kenburning-container {
    position: relative;
    overflow: hidden;
}
.kenburning-container img {
    position: absolute;
    max-width: none;
    top: 0;
    left: 0;
    z-index: 8;
}
.kenburning-container img.active {
    z-index: 10;
}
.kenburning-container img.last-active {
    z-index: 9;
}