I used stylebox to create backgrounds for headings on part of my site. A problem I had was that with fluid width template setting the text paragraphs started wrapping around the fixed width stylebox headings.

As I hadn't used HTML for quite some time it took a little while to figure out. The solution is very simple and in case anyone else equally non HTML savvy is wondering hot to stop this then inserting <br clear="all"/> within the <p> </p> of the paragraph stops the wrapping.