.scroll-container {
    height: 700px;              /* Visible area */
    width: 400px;
    overflow: hidden;
    position: relative;
    border: 2px solid #ccc;
}

.scroll-track {
    display: flex;
    flex-direction: column;
    animation: verticalScroll 20s linear infinite;
}

.scroll-track img {
    width: 100%;
    display: block;
}

@keyframes verticalScroll {
    from {
        transform: translateY(0);
    }
    to {
        transform: translateY(-50%);
    }
}