Forum:How to make navbar transparent

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

In the picture, I edited the navbar (the navbar, below the "On The Wiki", showing Wiki Activity... etc. I want to make a transparent background, 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 bg which is transparent enough to view the header background, "the houses". Apart from that, I also wish to make the blue color that appear when I hover my mouse to the "on the wiki" to moderately transparent, if that is possible.

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