body{

    align-items: center;
    justify-content: center;
}
@keyframes scroll{
    0%{
        transform: translateX(0);
    }
    100%{
        transform: translateX(calc(-250px * 7));
    }
}
.slider{
    height: 150px;
    margin: auto;
    overflow: hidden;
    position: relative;
    width: auto;
}
.slider .slide-track{
    animation: scroll 25s linear infinite;
    display: flex;
    width: calc(250px * 14);
}

.slider .slide{
    height: 150px;
    width: 300px;
    padding-left: 10px;
    padding-right: 10px;
}