@keyframes scroll {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(calc(-250px * 4));
    }
}

.slider {
    background: white;
  
    height: 130px;
    margin: auto;
    overflow: hidden;
    position: relative;
    width: 100%;
}

    

    .slider::after {
        right: 0;
        top: 0;
        transform: rotateZ(180deg);
    }

    .slider::before {
        left: 0;
        top: 0;
    }

.slide-track {
    animation: scroll 40s linear infinite;
    display: flex;
    width: calc(250px * 8);
}

.slide {
    height: 100px;
    width: 250px;
}