.gallery-grid .gallery-caption {
  position: absolute;
  top: 0;
  left: 0;
  background: rgba(0,0,0,0.5);
  width: 100%;
  height: 100%;
  display: flex;
  align-items: flex-end;
  opacity: 0;
  transition: opacity 0.3s ease-in-out;
}

.gallery-grid-item:hover .gallery-caption {
  opacity: 1;
}

.gallery-caption-content {
  color: white;
  padding: 1rem;
  text-align: center;
}