.collapse:not(.show) {
  display: none; }

.collapsing {
  position: relative;
  height: 0;
  overflow: hidden;
  -webkit-transition: height 0.35s ease;
  -o-transition: height 0.35s ease;
  transition: height 0.35s ease; }
  @media screen and (prefers-reduced-motion: reduce) {
    .collapsing {
      -webkit-transition: none;
      -o-transition: none;
      transition: none; } }