What did I mess up?

I installed my first Zen Cart this morning. By now i'm slightly overwhelmed.:shocking:

I went through the tutorial and changed most of the things so far that i want changed. I also removed all the things from the main page that I didnt' want. I want a neat, uncluttered page. I'm starting with the default template that installed and working from there. I'm not picky.

I was changing the height of the header to accomodate my new logo and I also changed the background color. Now, all the borders are gone from my main page and the featured products are not wraping in columns. They line up single file. Did I accidentally mess something up in the css file?

My site is http://www.gapproducts.com/shop

I had a quick look, but all looks fine with your site. I gather you have fixed the problem?

Maybe. I cleaned out the catalog so there aren't any featured items right now. What would cause them to stack up single file instead of in three columns?

How's everything down under?

Can you tell me why I have two horizontal green bars above the logo? Is something out of order?