Thank you Denzel!
All the codes works perfectly!

About second question, I found the solution that you give me, but it change all menu color. In this case I would like to have a two color menu. For example: Main Words in the menu blue and submenu gray.
Maybe I need to do some changes in .nav-holder objet but just color background for submenu ítems (In my menu is BLOG> Autores del Blog)