.wp-block-image.is-style-pop-up-on-hover > img {
  transition: transform 300ms ease-in-out;
  transform: scale(0.95);
}
.wp-block-image.is-style-pop-up-on-hover > img:hover, .wp-block-image.is-style-pop-up-on-hover > img:focus {
  transform: scale(1);
}