hugo-snap-gallery/assets/scss/snap-gallery.scss

.snap-wrapper {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;

  /* Create equal columns in flexbox */
  .snap-image {
    cursor: pointer;

    /* Column amount and width are configurable by style variables */
    width: calc(100% / var(--columns) - 10px);
    min-width: var(--min-width);

    img {
      aspect-ratio: 16/10;
      width: 100%;
      object-fit: cover;
    }
  }
}

.snap-lightbox {
  /** Default lightbox to hidden */
  display: none;

  /** Position and style */
  position: fixed;
  z-index: 999;
  width: 100%;
  height: 100%;
  text-align: center;
  white-space: nowrap;
  top: 0;
  left: 0;
  background: rgba(0, 0, 0, 0.8);

  /* keep lightbox in middle. TODO: hacky, and not realibly in middle */
  &:before {
    content: "";
    display: inline-block;
    vertical-align: middle;
    width: 0;
    /* adjust for white space between pseudo element and next sibling */
    margin-right: -.25em;
    /* stretch line height */
    height: 100%;
  }

}

// /* Click on the complete background closes the lightbox */
// /* Exception: arrow in gallery, they have higher z-index */
// a.snap-lightbox-close {
//   position: fixed;
//   z-index: 800;
//   width: 100%;
//   height: 100%;
//   text-align: center;
//   white-space: nowrap;
//   top: 0;
//   left: 0;
// }

/* Container for image */
.snap-lightbox-inner {
  display: inline-block;
  vertical-align: middle;
  white-space: normal;
  max-width: 90%;
  max-height: 80%;
  height: 100%;

  /* Number text (1/3 etc) */
  .numbertext {
    color: #f2f2f2;
    background-color: #000;
    font-size: 12px;
    padding: 8px 12px;
    position: absolute;
    top: 10%;
  }

  img {
    max-height: 100%;
  }

  // TODO: Untested
  p {
    color: #fff;
    z-index: 810;
    position: relative;
  }
}

// /* Caption text */
// .caption-container {
//   text-align: center;
//   background-color: black;
//   padding: 2px 16px;
//   color: white;
// }

/* prev/next arrows & close button */
.snap-lightbox-prev,
.snap-lightbox-next {
  position: fixed;
  z-index: 800;
  width: 5%;
  height: 100%;
  text-align: center;
  top: 0;
  cursor: pointer;

  .snap-lightbox-arrow {
    display: inline-block;
    position: fixed;
    top: 50%;
    z-index: 900;
    border: solid #fff;
    border-width: 0 7px 7px 0;
    display: inline-block;
    padding: 1%;
  }

  &:hover>.snap-lightbox-arrow {
    border-color: #999;
    transition: all 0.25s ease;
  }
}

.snap-lightbox-prev {
  left: 0;

  .snap-lightbox-arrow {
    left: 2%;
    transform: rotate(135deg);
    -webkit-transform: rotate(135deg);
  }
}

.snap-lightbox-next {
  right: 0;

  .snap-lightbox-arrow {
    right: 2%;
    transform: rotate(-45deg);
    -webkit-transform: rotate(-45deg);
  }
}

/* The Close Button */
.snap-close {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 15px;
  right: 15px;
  height: 50px;
  width: 50px;
  color: white;
  font-size: 50px;
  font-weight: bold;
  z-index: 900;

  &:hover,
  &:focus {
    color: #999;
    text-decoration: none;
    cursor: pointer;
  }
}

@media screen and (max-width: 767px) {
  .snap-lightbox-inner {
    max-width: 80%;
  }

  .snap-lightbox-prev,
  .snap-lightbox-next {
    width: 10%;
  }

  .snap-lightbox-close-button {
    width: 10%;
    height: calc(10vw);
    /* ~10% width */
  }
}