audiobookshelf/client/assets/transitions.css

.slide-enter-active {
  -moz-transition-duration: 0.1s;
  -webkit-transition-duration: 0.1s;
  -o-transition-duration: 0.1s;
  transition-duration: 0.1s;
  -moz-transition-timing-function: ease-in;
  -webkit-transition-timing-function: ease-in;
  -o-transition-timing-function: ease-in;
  transition-timing-function: ease-in;
}

.slide-leave-active {
  -moz-transition-duration: 0.2s;
  -webkit-transition-duration: 0.2s;
  -o-transition-duration: 0.2s;
  transition-duration: 0.2s;
  -moz-transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
  -webkit-transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
  -o-transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
  transition-timing-function: cubic-bezier(0, 1, 0.5, 1);
}

.slide-enter-to, .slide-leave {
  max-height: 600px;
  overflow: hidden;
}

.slide-enter, .slide-leave-to {
  overflow: hidden;
  max-height: 0;
}



.menu-enter, .menu-leave-active {
  transform: translateY(-15px);
}
.menu-enter-active {
  transition: all 0.2s;
}
.menu-leave-active {
  transition: all 0.1s;
}
.menu-enter,
.menu-leave-active {
  opacity: 0;
}