.lightbox-overlay {
  position: fixed;
  top: 0; left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(0, 0, 0, 0.95);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.lightbox-overlay img {
  max-width: 90%;
  max-height: 90%;
  box-shadow: 0 0 20px black;
}

.lightbox-caption {
  position: absolute;
  bottom: 20px;
  color: #fff;
  text-align: center;
  font-size: 1rem;
  width: 100%;
}

.lightbox-nav {
  position: absolute;
  top: 50%;
  font-size: 2rem;
  color: white;
  padding: 0 1em;
  cursor: pointer;
  user-select: none;
}

.lightbox-prev { left: 10px; }
.lightbox-next { right: 10px; }