Applying a css command only relevant to a certain page

Hi all

I was looking for a pointer in the right direction of getting a bit of code to work only on one particular page.

body.classifieds.cf-image {

position: absolute; }

This doesnt work but what I am trying to achieve is to get .cf-image to be absolute only on the classified page.

I do not want .cf-image to be absolute on any other pages such as when a member clicks on the ad.

Is it possible to get the css to apply to the classifieds page only?

Kind regards

Mark