.photo-frame {
  position: relative;
  overflow: hidden;
}

.photo-frame.photo-blurred img {
  filter: blur(18px);
  transform: scale(1.05); /* hide blur edge artifacts */
  transition: filter 0.2s ease;
}

.photo-frame.photo-blurred.revealed img {
  filter: none;
  transform: none;
}

.photo-frame .reveal-btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.photo-frame.revealed .reveal-btn {
  display: none;
}