.photo-wrapper::after {
  background-color: #fff;
  content: "\1F50D"; /* unicode loupe 🔍 */
  position: absolute;
  font-size: 1.7rem;
  color: rgba(255, 255, 255, 1);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
  border: 1px solid rgba(230, 230, 230, 1);
  border-radius: 0.6rem;
  padding: 0.2rem 1rem 0.1rem 1rem;

  /** original code **/
  opacity: 0;
  transition: opacity 0.2s ease;
}

.photo-wrapper:hover::after {
  box-shadow: 0 0 15px #fff;
  opacity: 1;
}