Weird border on mainbody position

Hello all,

Setting up the template just now, I installed the full demo package and started to strip out modules that I didn't need. I want to display something simple on the mainbody position, whether I do it with a Custom HTML type or ArticleAsModule type module on the mainbody position, I get these weird borders on the right and bottom of the module itself. Does anyone know how to remove them? Any help would be appreciated.

try use the Module Class Suffix " clear" (remember the space before clear...

works in the header i know - maybe also on the mainbody...

That worked! Thank you very much!