Well you have to use SOME HTML of course, e.g the div tags, but if you want to use CSS for the layout (which I would definitely advise  ), then I would put them in a wrapper div (one to contain all the other divs) and then put three more divs inside that one. Give them percentage values for the width and 100% height and you'll have a three column layout!
If you want that in a little more detail, then PM me and I'll be happy to help 
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