body{
    align-items: center;
    justify-content: center;
}
@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: 100px;
    width: 250px;
}