.nav-topbar {
  max-height: 60px;
  opacity: 1;
  transition: max-height 0.35s ease, opacity 0.25s ease, padding 0.3s ease;
}
.nav.scrolled .nav-topbar {
  max-height: 0;
  opacity: 0;
  padding-block: 0;
  pointer-events: none;
}