BookStack/resources/assets/sass/_animations.scss

.anim.fadeIn {
  opacity: 0;
  animation-name: fadeIn;
  animation-duration: 160ms;
  animation-timing-function: ease-in-out;
  animation-fill-mode: forwards;
}

@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

.anim.notification {
  transform: translate3d(580px, 0, 0);
  animation-name: notification;
  animation-duration: 3s;
  animation-timing-function: ease-in-out;
  animation-fill-mode: forwards;
}

@keyframes notification {
  0% {
    transform: translate3d(580px, 0, 0);
  }
  10% {
    transform: translate3d(0, 0, 0);
  }
  90% {
    transform: translate3d(0, 0, 0);
  }
  100% {
    transform: translate3d(580px, 0, 0);
  }
}