I made it , and i had to change #menu not #nav
However i have 2 problems
1-sub menu changed to that color aswell which i dont want to . how can i keep the submenu in bg white and font black ? when the one button has been selected the menu changed to the button i wanted (green) and sub menu as well(green)
2- i copied the code but still cannot see that TRIANGLE in center bottom of each bottoms that includes SUB MENU.