:root {
    --card-height: 40vw;
    --card-margin: 4vw;
    --card-top-offset: 1em;
    --outline-width: 0px;
}

@supports (animation-timeline: view()) {
    .scrollcards .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 */
        background: transparent !important;
    }

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

    #cards {
        --numcards: 4;
        view-timeline-name: --cards-element-scrolls-in-body;
    }

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

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

#card_1 {
    --index: 1;
}

#card_1 .card__content{
    background: #4995b6;
    color: #fff;
}

#card_2 {
    --index: 2;
}

#card_2 .card__content{
    background: #17585f;
    color: #fff;
}

#card_3 {
    --index: 3;
}

#card_3 .card__content{
    background: #939597;
    color: #fff;
}

#card_4 {
    --index: 4;
}

#card_4 .card__content{
    background: #648f93;
    color: #fff;
}

.scrollcards .card {
    position: sticky;
    top: 160px;
    padding-top: calc(var(--index) * var(--card-top-offset));
}

.card__content {
    transform-origin: 50% 0;
    will-change: transform;
    overflow: hidden;
    border-radius: 50px;
}

ul.scrollcards{
    padding-left: 0;
    margin-bottom: 0;
}

.scrollcards #cards {
    list-style: none;
    outline: 0;
    display: grid;
    grid-template-columns: 1fr;
    grid-template-rows: repeat(var(--numcards), var(--card-height));
    gap: var(--card-margin);
}