.lightbox {
  z-index: 200;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.9);
}

.lightbox img {
  position: absolute;
  left: 50%;
  top: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
  z-index: -1;
}

.lightbox img.zoomed-out {
  height: auto;
  max-height: 98vh;
  width: auto;
  max-width: 98vw;
}

.lightbox img.zoomed-in {
  height: 100%;
  width: 100%;
}

.lightbox button {
  z-index: 3;
  background: none;
  padding: $half-space;
  margin-left: $half-space;
  margin-top: $half-space;
  border: none;
  color: #fff;
  font-size: 2em;
}

.lightbox-hidden {
  display: none;
  visibility: hidden;
}

.lightbox-visible {
  display: block;
  visibility: visible;
}