.lightbox {
  position: fixed;
  z-index: 9;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0 0 0 / 0.98);
  display: none;
}

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

/* Lightbox close button*/
.lb__close {
  color: #fff;
  background-color: var(--uphe-blue-dark);
  cursor: pointer;
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font-size: 1.5rem;
  transition: color var(--hover-transition-duration),
    background-color var(--hover-transition-duration);
  width: 3rem;
  height: 3rem;
  line-height: 3rem;
  border-radius: 100%;
  text-align: center;
  cursor: pointer;
}
.lb__close:hover {
  color: var(--uphe-gray);
  background-color: #000;
}