TetraBB.com Home of Tetra-WebBBS and TetraBB PRO

OK, I get the concept, only problem is the webbbs.css is a million miles long and full of variables that I dont understand, so finding the parts that I need to make transparent is seeming impossible to me... I've been trying with no luck. Can you help me identify the css section for the navigation bars as well as the post, preview and read forms?
Also, when I put in "transparent" for the color do I include the quotes ""?
Thanks a bunch for your help