ionic-framework/scss/ionic/_animations.scss

$bezier-function: cubic-bezier(.1, .7, .1, 1);
 
/*
.slide-in-up.enter {
  -webkit-transform: translate3d(0, 100%, 0);
  transform: translate3d(0, 100%, 0);

  -webkit-transition: -webkit-transform .25s ease-in-out, opacity 1ms .25s;
  transition: transform .25s ease-in-out, opacity 1ms .25s;
}
*/
@-webkit-keyframes slide-in-up {
  0% {
    opacity: 0;
    -webkit-transform: translate3d(0, 100%, 0);
            transform: translate3d(0, 100%, 0);
  }
  100% {
    opacity: 1;
    -webkit-transform: translate3d(0, 0, 0);
            transform: translate3d(0, 0, 0);
  }
}

.slide-in-up.active {
  animation: slide-in-up 0.5s;
  -webkit-animation: slide-in-up 0.5s;
  -webkit-animation-timing-function: $bezier-function;
}

@keyframes fadein {
    from { opacity:0; }
    to { opacity:1; }
}
@-webkit-keyframes fadein { /* Safari and Chrome */
    from { opacity:0; }
    to { opacity:1; }
}

.fade-in {
  opacity: 0;
  animation: fadein 0.5s;
  -webkit-animation: fadein 0.5s;
}