Add text to every page

Is there a way to add text to my all of my pages using CSS? I would like to have a footer with a link and a copyright. Is there a way to set it up so I only have to make the change in the css code and it will update all of my other pages?

This may have been asked before, but I couldn’t find it. Looking around on different sites, I have only one similar response, but it said that this could be done in some browsers, but not in IE…this post was in 2005 though. Has anything changed since then? Thanks for the help.