.perspective-1200 {
  perspective: 1200px;
}
.preserve-3d {
  transform-style: preserve-3d;
}
.backface-hidden {
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}
#m1-turning-page {
  transform-origin: 0% 50%;
  will-change: transform, opacity;
}
#m1-image-modal.m1-flip-active #m1-modal-img {
  opacity: 1;
}