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Various terms have been used over the years: liquid, fluid and elastic page design spring to mind.
You'll find hundreds of tutorials if you search with those keywords.
This kind of page layout was widely used a decade ago when nested tables, specified with % widths, were all the rage. CSS was in its infancy back then.
Today's CSS driven layouts tend to lend themselves more to fixed width page layout.
Thank you, Ill do some searching and if successful come back with correct answer for you.
By setting table width to 100%, this creates a liquid or fluid table that resizes to viewport.
CSS liquid layouts:
Thanks to both of you for your help, you gave me the direction I needed to get this solved.