Forum:How to make navbar transparent

Navbar transparent
I copied the wikia.css code from another website, and it works perfectly. However, I wish to tweak it a bit, but I just couldn't because I have no knowledge of coding. I need some help. Picture explains better

In the picture, the main navbar, ("On the Wiki", "Community") are having white transparent background. When I hover my mouse to them, it will turn blue and the sub-navbar will pop out an the bottom. At first, the sub navbar are having blue color background. I want to make a transparent background for the second navbar, but I don't know how. So in the end, I removed the navbar background. It looks bad, so I came here to request help on creating a transparent background which is transparent. Apart from that, I also wish to make the blue color that appear when I hover my mouse to the main header to moderately transparent, if that is possible.

The link to my website : http://byfanonworld.wikia.com

Edited - Bump and edited my explaination