Menú Principal en página del anuncio

Hello Greg
Thanks for your help
I have two menus on my website, but the main menu can not be seen on the pages of the ads. you can see the upper menu in light blue, but the main menu loses its dark blue and when mixed with the white background of the page you can not see the menu. What can I do to make the main menu retain its dark blue background and be seen on the ads page?

The page I need help with: [log in to see the link]