UBB.threads PHP Forum Software Community Forums Resources and Customizing How Do I? Dumb ? about HTML Includes

I have been way form UBB too long…I used to know this stuff, but….if I want a header above the forum, I know I have to insert HTML code in the Default Header Include field. But I want the background color, text, etc, that appears up there to take on the colors of certain tables within the main forum. Can someone give me a hint to get me started in the right direction? Thanks