Creating menus in CSS? Is it possible?

    I have a webpage that I'm changing and I want to know if
    it's possible to create menus with CSS so I don't have to
    code in the menu on each page. Basically, if I have a menu
    on the left-hand side, I want to use CSS so I can just put
    the menu there each time without having to re-code the
    current page? I already copy/paste, but I was looking for a
    better option.