I can work a little bit with CSS, but it isn't my best computer language
If you want to work with CSS by yourself, you can try this links:
CSS Creator CSS Generator
Cascading Style Sheets - CSS - Generator
CSS generator
But when I look at your website, I see there are used lots of images. You page is loading very slow...
Creating Fast Loading Sites
And when you want to create free forums, it is not very smart to build them in an iframe, because the forum you are using has a fixed width (instead of a fluid width). The best option is to load your forum in target="new" so that it is easier to use (which is very important on the Internet
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Free Forums
phpBB
Informe