.slider {
    width: 90vw;
    height: auto;
    margin: auto;    
}

.slider .slide-track {
    display: flex;
    animation: scroll 90s linear infinite;
    -webkit-animation: scroll 60s linear infinite;
    width: calc(200px * 12);
}

.slider .slide {
    width: 200px;
}

.slider .slide img {
    width: 80%;
}

@keyframes scroll {
    0% {
        -webkit-transform: translateX(0);
        transform: translateX(0);
    }
    100% {
        -webkit-transform: translateX(calc(-200px * 7));
        transform: translateX(calc(-200px * 7));
    }
}