How to make an area expand to accomodate text

[drumz]

I have a pretty simple site that I possibly need some of the sub-pages to expand to make room for more text. Do I use percentages for the div height? This site is built with a top, a centered nav, a header area, the body and the footer. I want everything to stay the same size except for the body area. Can someone point me to examples of this type of layout? Or articles?
Thanks in advance!

[TheDoc]

A div, in its essence, is design to expand with content. If the div isn’t expanding, it’s probably due to the fact that it has a set height.

[Author]

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