so it looks to me like the dropdowns are accessed through a 'role' so to style that you would use something like the following, i believe:
-btn-subeta-css[role=menu]
-btn-interact-css[role=menu]
-btn-commerce-css[role=menu]
-btn-personal-css[role=menu]
-btn-cs-css[role=menu]
[edit]actually that didn't work when i tested it just now, give me a second.
[edit]okay i think i got it this time? to change the color you would style both "-btn-subeta-css li" and "-btn-subeta-css ul" and to add, say, rounded corners you would just style "-btn-subeta-css ul" (of course changing the name for each tab) so that would look something like this:
-btn-subeta-css li {background:}
-btn-subeta-css ul {background:; border-radius:10px}