.lightbox {
  display: none; /* nascosto all'inizio */
  position: fixed;
  z-index: 2000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  background-color: rgba(0,0,0,0.9);
  text-align: center;
  padding-top: 60px;
}

.lightbox img.lightbox-image {
  max-width: 90%;
  max-height: 70vh;
}

.lightbox-caption {
  color: #fff;
  margin-top: 15px;
  font-size: 1.1em;
}

.close {
  position: absolute;
  top: 15px;
  right: 35px;
  color: #fff;
  font-size: 40px;
  font-weight: bold;
  cursor: pointer;
}

.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  color: #fff;
  font-weight: bold;
  font-size: 30px;
  user-select: none;
  transform: translateY(-50%);
}

.prev {
  left: 20px;
}

.next {
  right: 20px;
}

@media (max-width: 768px) {

    .prev, .next {
        top: 30%;
    }
    
}