carousel.css

ul {
    width: 100%;
    position: relative;
}

li {
    position: absolute;
    top: 0;
    left: 0%;
    right: 0%;
    bottom: 0;
}

.is-off-left {
    left: -100%;
    right: 100%;
}

.is-off-right {
    left: 100%;
    right: -100%;
}