@keyframes sakura-slit-out-horizontal {
  0% {
    transform: translateZ(0) rotateX(0);
    opacity: 1;
  }
  54% {
    transform: translateZ(-160px) rotateX(87deg);
    opacity: 1;
  }
  100% {
    transform: translateZ(-800px) rotateX(90deg);
    opacity: 0;
  }
}

@mixin slit-out-horizontal {
  animation-name: sakura-slit-out-horizontal;
  animation-duration: 0.5s;
  animation-fill-mode: both;
  animation-timing-function: ease-out;
}