.js-Carousel {
    margin: 0 auto 2em;
    overflow: hidden;
    position: relative;
}
.js-Carousel > ul {
    width: 9999px;
    display: flex;
}

.js-Carousel > ul li {
    transition: margin-left 0.3s ease;

    flex: 0 0 100vw;
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

@media screen and (min-width: 1200px) {

    .js-Carousel > ul li {
        flex: 0 0 300px;
        margin: 0 6px;
    }
}

.js-Carousel > ul li::after {
    content: none;
}