Hello, I'm developing a page in K2 but I'm new to this.

 

I have couple of categories which all have the same sub-template. Menu items are assigned by K2 tags. Now I'd like to make sponsored articles which I want to appear in every menu item. So basically I thought I need to make a 'sponsored articles' category and prepare some special sub-template. But how do I edit CSS properties for a sub-template ?

 

Or maybe there is another (simpler) way of doing such things ? Thanks.