If i understand you correctly, no you cant use CSS to put adsense on your pages. CSS is used to style HTML elements for example chaning the colour of text. It cannot be used to actually put content onto a website.
Yeah that's right. I guess the OP doesn't know the exact definition of CSS. http://www.google.com/search?client=safari&rls=en&q=define:css&ie=UTF-8&oe=UTF-8
What i use CSS for with my adsense for is something like so, <p class="adsense-left" align="center">ADSENSE CODE</p> I wrap things around it for positioning etc, but you cant change the font, its impossible really.
No, you can't change the styling of the adsense code - unless you are a preferred adsense publisher or you are a company and have relationship with Google