.dropdown-submenu{position:relative}.dropdown-submenu .dropdown-menu{top:0;left:100%;margin-top:-1px;display:none;position:absolute}.dropdown-submenu:hover .dropdown-menu{display:block}.dropdown-menu.scrollable-dropdown{max-height:300px;overflow-y:auto}.dropdown-menu.scrollable-dropdown::-webkit-scrollbar{width:6px}.dropdown-menu.scrollable-dropdown::-webkit-scrollbar-thumb{background-color:#ccc;border-radius:4px}