gentelella-rtl/vendors/animate.css/source/sliding_exits/slideOutLeft.css

Gentelella RTL Admin is a free to use Bootstrap admin template

@keyframes slideOutLeft {
  from {
    transform: translate3d(0, 0, 0);
  }

  to {
    visibility: hidden;
    transform: translate3d(-100%, 0, 0);
  }
}

.slideOutLeft {
  animation-name: slideOutLeft;
}