@keyframes scroll {
    0% {
        transform: translateX(0);
   }
    100% {
        transform: translateX(calc(-250px * 7));
   }
}
.slider {
    height: 100px;
    margin: auto;
    overflow: hidden;
    position: relative;
    width: auto;
}
.slider .slide-track {
    animation: scroll 40s linear infinite;
    display: flex;
    width: calc(250px * 14);
}
.slider .slide {
    height: 250px;
    width: 250px;
}

.uber-slide {
    margin: 30px auto 0; /* 10px top margin, horizontally centered, no bottom margin */
}