Style the Sub-menus for a Horizontal Navigation Menu with Drop-down Sub-menus

Part 4/5
Style the submenus so that they appear on hover from a display none to a display block. Focus on the importance of the positioning of the submenu in relation to the parent list item, which is what the user is actually hovering over.

Demo file: www.patreon.com/posts/32282335

Series
Part 1:    • Create and Center a Horizontal Naviga...  
Part 2:    • Style a Horizontal Navigation Menu wi...  
Part 3:    • Position the Sub-menus for a Horizont...  
Part 4:    • Style the Sub-menus for a Horizontal ...  
Part 5:    • Add Transition Effects to a Horizonta...