.mfp-with-zoom .mfp-container,
.mfp-with-zoom.mfp-bg {
  opacity: 0;
  -webkit-backface-visibility: hidden;
  /* ideally, transition speed should match zoom duration */
  -webkit-transition: all 0.3s ease-out;
  -moz-transition: all 0.3s ease-out;
  -o-transition: all 0.3s ease-out;
  transition: all 0.3s ease-out;
}

.mfp-with-zoom.mfp-ready .mfp-container {
    opacity: 1;
}
.mfp-with-zoom.mfp-ready.mfp-bg {
    opacity: 0.8;
}

.mfp-with-zoom.mfp-removing .mfp-container,
.mfp-with-zoom.mfp-removing.mfp-bg {
  opacity: 0;
}