Add min-height to the mega menu
Currently, all menus are differently sized based on their content. It makes the mega menu seem to "jump" when paging through.
Adding a min-height to the mega menu will allow us to have a consistently sized mega menu across different menus.
Different websites will utilize an additional amount of links in their menus. So we should also add a mega menu min-height variable for them to tweak it based on their needs.