:root {
    --card-height: 40vw;
    --card-margin: 1vw;
    --card-top-offset: 1em;
}

#cards {
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(var(--numcards), var(--card-height));
    gap: var(--card-margin);
    /* Make place at bottom, as items will slide to that position*/
    padding-bottom: calc(var(--numcards) * var(--card-top-offset));
    /* Don't include the --card-margin in padding, as that will affect the scroll-timeline*/
    margin-bottom: var(--card-margin);
}

#card1 {
    --index: 1;
}

#card2 {
    --index: 2;
}

#card3 {
    --index: 3;
}

#card4 {
    --index: 4;
}

#card5 {
    --index: 5;
}

#card6 {
    --index: 6;
}

.card {
    position: sticky;
    top: 6em;
    padding-top: calc(var(--index) * var(--card-top-offset));
}

.card-content {
    transform-origin: 50% 0;
    will-change: transform;
}


@supports (animation-timeline: view()) {
    #cards {
        view-timeline-name: --cards-element-scrolls-in-body;
    }

    .cards2 {
        --numcards: 2;
    }

    .cards3 {
        --numcards: 3;
    }

    .cards4 {
        --numcards: 4;
    }

    .cards5 {
        --numcards: 5;
    }

    .cards6 {
        --numcards: 6;
    }

    .card {
        --index0: calc(var(--index) - 1); /* 0-based index */
        --reverse-index: calc(var(--numcards) - var(--index0)); /* reverse index */
        --reverse-index0: calc(var(--reverse-index) - 1); /* 0-based reverse index */
    }

    @keyframes card-scale {
        to {
            transform:
                    scale(calc(1.1 - calc(0.1 * var(--reverse-index))));
        }
    }

    .card-content {
        --start-range: calc(var(--index0) / var(--numcards) * 100%);
        --end-range: calc((var(--index)) / var(--numcards) * 100%);

        animation: linear card-scale forwards;
        animation-timeline: --cards-element-scrolls-in-body;
        animation-range: exit-crossing var(--start-range) exit-crossing var(--end-range);
    }
}