.dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  background-color: white;
  list-style: none;
  top: 100%;
  left: 0;
  min-width: 150px;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  z-index: 10;
}

.dropdown-menu li a {
  display: block;
  padding: 10px;
  color: #333;
  text-decoration: none;
}

.dropdown:hover .dropdown-menu {
  display: block;
}

.mobile-submenu {
  display: none;
  list-style: none;
  padding-left: 15px;
  background-color: #f9f9f9;
}

.mobile-submenu li a {
  display: block;
  padding: 10px;
  color: #333;
  text-decoration: none;
}

.mobile-dropdown.open > .mobile-submenu {
  display: block;
}

.mobile-submenu {
  max-height: 300px;
  overflow-y: auto;
  background-color: white; 
  border: 1px solid #ccc;
  margin-top: 5px;
  padding-left: 15px;
  scrollbar-width: thin;
}

.mobile-submenu::-webkit-scrollbar {
  width: 6px;
}

.mobile-submenu::-webkit-scrollbar-thumb {
  background-color: #888;
  border-radius: 3px;
}

.mobile-submenu::-webkit-scrollbar-thumb:hover {
  background-color: #555;
}