:root {
    --lightbox-padding: 1rem;
}
* {
    box-sizing: border-box;
}
.thumbnails {
    display: flex;
    gap: .5rem;
}
.thumbnails a {
    display: flex;
}
.lightbox {
    display: none;
    padding: 0;
    margin: 0;
    position: fixed;
    inset: 0;
    border: none;
    background-color: Canvas;
    padding: var(--lightbox-padding);
}
.lightbox:target {
    display: block;
}
.close {
    position: absolute;
    top: var(--lightbox-padding);
    right: var(--lightbox-padding);
}
figure {
    padding: 0;
    margin: 0;
    width: 100%;
    height: calc(100vh - var(--lightbox-padding) * 2);
    display: grid;
    place-items: center;
}
figcaption {
    position: absolute;
    bottom: var(--lightbox-padding);
}
.counter {
    position: absolute;
    left: var(--lightbox-padding);
    bottom: var(--lightbox-padding);
    margin: 0;
}
.prev, .next {
    position: absolute;
    top: 50%
}
.prev {
    left: var(--lightbox-padding)
}
.next {
    right: var(--lightbox-padding)
}