timeline.css

.card {
    --margin: 2.4rem;
    width: 100%;
    height: calc(100% - var(--margin) * 2);
    aspect-ratio: 12 / 16;
    margin: var(--margin) 0 var(--margin) var(--margin);
    position: relative;
}

.card__inner-wrap::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    height: 2rem;
    width: 100%;
    background: linear-gradient(to top, #000, transparent);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    width: 2.4rem;
    z-index: 100;
    height: 1px;
    background: #000;
    right: -2.4rem;
}

.card:last-child::before {
    display: none;
}

.card__background-item {
    opacity: .8;
}

.card__category-link {
    text-overflow: ellipsis;
}

.green .card__background-item {
    background-image: linear-gradient(90deg, rgba(238, 255, 132, 0), #eeff84 50%, rgba(238, 255, 132, 0));
}

.turquoise .card__background-item {
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0), #B4F2EF 50%, rgba(255, 255, 255, 0));
}

.pink .card__background-item {
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0), #F2A3FF 50%, rgba(255, 255, 255, 0));
}

.orange .card__background-item {
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0), #FF8551 50%, rgba(255, 255, 255, 0));
}

.red .card__background-item {
    background-image: linear-gradient(90deg, rgba(255, 255, 255, 0), #FB3C3C 50%, rgba(255, 255, 255, 0));
}

.timeline__data {
    display: none;
}

.navbar {
    position: fixed;
    top: 0;
    z-index: 10000;
    left: 0;
    right: 0;
}

.card:last-child {
    margin: var(--margin);
}

.card div img {
    width: 100%;
    margin-bottom: 4px;
}

.card div h1 {
    font-size: 1.2em;
    margin-bottom: 8px;
}

.card div p {
    margin-bottom: 8px;
}

.card div {
    /* width: 100%; */
    /* height: 100%; */
    /* overflow: hidden; */

}

.cell {
    --margin: .4rem;
    --tint: #CDD4F6;
    --left-width: 100%;
    --right-width: 0;
    --height: 1;
    flex-grow: 1;
    position: relative;
    min-width: 1.5rem;
    height: calc(var(--height));
    margin: 0 var(--margin) 0 0;
    cursor: pointer;
    user-select: none;
    background: #fff;

}

.cell:last-child {
    /* margin: var(--margin); */

}

.cell::before {
    display: block;
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    height: 100%;
    width: var(--left-width);
    background: var(--tint);
    content: '';
    z-index: 1000;
}

.cell::after {
    display: block;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    height: 100%;
    width: var(--right-width);
    background: var(--tint);
    content: '';
    z-index: 1000;
}

.cells-container::after {
    content: '';
    right: 0;
    position: absolute;
    width: 20rem;
    top: 0;
    pointer-events: none;
    height: 100%;
    background: linear-gradient(to left, #000, rgba(0, 0, 0, 0));
    transition: all 500ms ease;
}

.cells-container.end::after {
    content: '';
    opacity: 0;
}

.cells-container::before {
    content: '';
    left: 0;
    position: absolute;
    width: 7rem;
    top: 0;
    z-index: 10;
    pointer-events: none;
    height: 100%;
    background: linear-gradient(to right, #000, rgba(0, 0, 0, 0));

}

.year {
    --margin: .4rem;
    display: flex;
    justify-content: center;
    align-items: center;
    min-width: 6.8rem;
    background: #000;
    color: #fff;
    border-radius: 100vh;
    height: 100%;
    margin: 0 var(--margin) 0 0;
    cursor: pointer;
    transition: all 300ms ease;
    user-select: none;

}

.first-year {
    --margin: .2rem;
    --left: 0px;
    left: var(--left);
    cursor: pointer;
    user-select: none;
}

.cards {
    overflow-x: hidden;
}

.grid {
    display: none;
    width: 100vw;
    height: 100vh;
}

.center {
    display: flex;
    width: 100vw;
    height: 100vh;
    justify-content: center;
    align-items: center;
    user-select: none;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

@media(max-width: 768px) {
    .card {
        --margin: .8rem;
    }

    .card {
        aspect-ratio: 9 / 16;
    }
}