.sidebar-dropdown-menu {
  display: flex;
  flex-direction: column;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
}
.sidebar-dropdown-menu.show {
  max-height: 500px;
  opacity: 1;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1), opacity 0.25s ease;
}