Someone posted a comment to an old topic (circa 2005), which I have now sent back to it's place in the stack. However a discussion wich ensued, within that original thread, is still worthy of a re-read.
Martin starts this part of the discussion with a reply to the starter of the main discussion who was wanting to make a 'fixed-width' Moodle theme...
http://moodle.org/mod/forum/discuss.php?d=18786#p88868
Cheers
Mary