.fade {
  transition: opacity .15s linear
}
.fade:not(.show) {
  opacity: 0
}
.collapse:not(.show) {
  display: none
}
.collapsing {
  position: relative;
  height: 0;
  overflow: hidden;
  transition: height .35s
}
@media (prefers-reduced-motion:reduce) {
  .collapsing,
  .fade {
    transition: none
  }
}