Different styles on different pages

[محروم.كوم]

Hi all,
I created this site using phpWebSite (it's still hidden to the user that access just the website main page) http://www.romagranata.it/index.php

I made some changes to the position.css but obviously this column organization does not fit my needs on the others pages (for example, on the blog page).

So I need to use a different style for the main page respect to the style of the others pages.

Any suggestion? __DEFINE_LIKE_SHARE__