wordpress categorys layout

if your theme has a category.php, edit this;

if the theme does not have a category.php, create one from a copy of archive.php or index.php – then edit…

there are several topics in this forum with solutions to a two-column layout – try forum search.

this usually means wrapping each post into a div, formatted with a width less than half the width of the available space and floated left.

the grey square is caused by (in style.css):

.primary_content_wrap .container {
		background: url(images/content.gif) repeat-y 0% 0%;
	}

is there anyway to keep it on my main home page

but delete it from my category pages ??

use the category specific output of body_class():
http://codex.ww.wp.xz.cn/Function_Reference/body_class

i.e.:

.category .primary_content_wrap .container { background: none; }