Scrollable Menu
A modern website can include a large number of pages and, as a result, may have too many links in the navigation menu. Well, you can put them into the sub-navigation lists, but in this case, the submenus become too tall and may go over the screen border. To save screen space, you can make the submenus scrollable. It is an elegant solution that will save screen space and help a user focusing on the content.
This example shows a navigation bar with scrollable sub-navigation lists. The menu includes a complete list of countries from all over the world and has 250+ elements. All countries are split into three groups. Each group has a title (item in the main menu) with a scrollable submenu.