Okay, i can get to change the background at index.css of the vertex theme, but that only changes one background, when i try to change the background of all the boards/home page, i just can't.. Can't find where is the code, have tried different parts and nothing, just get to change small blocks and not all as a whole site.

Also, if i use an image as background it doesn't fill the heigh of site, how can i do that without creating a huge image? 

What background are you talking about?

The one of all the boards/homepage, because right now i only can change the background that is at the borders of the site, but any other "block" like articles/post/boards/categories/affiliates/etc.. those parts i can't find to change that background. 

I think I know what you are talking about but its still very unclear.

Try changing this tag in your css:

Code: [Select]

#content_section