.arrow {
  display: inline-block;
  margin-left: 8px;
  font-size: 0.9em;
  transition: transform 0.3s;
}
.dropdown.open > a .arrow {
  transform: rotate(180deg);
}
.dropdown > a .arrow::before {
  content: "\f078"; /* FontAwesome fa-chevron-down */
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  display: inline-block;
}
.dropdown-menu {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(-8px);
  transition: max-height 0.35s cubic-bezier(.4,0,.2,1), opacity 0.35s, transform 0.35s;
}
.dropdown.open > .dropdown-menu {
  max-height: 600px;
  opacity: 1;
  transform: translateY(0);
}
@media (max-width: 900px) {
  .arrow {
    display: none;
  }
}