.user-is-tabbing :focus {
  outline: 1px dotted currentColor;
  outline-offset: 2px; }

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

.collapsing {
  position: relative;
  height: 0;
  overflow: hidden;
  transition: height 0.35s ease, visibility 0.35s ease; }

@media (prefers-reduced-motion: reduce) {
  .collapsing {
    transition: none; } }