The dimensions between titlebar and statusbar (where content resides) can vary, depending on how the window is resized. titlebar and statusbar are fixed heights, content needs to be flexible.
The DIVs inside of content adjust to the size of content with no overflow needed.
container fills most of the window with a 20px margin, titlebar is fixed at the top, content should be flexible, and statusbar is fixed at the bottom.
Thanks for the tips. Trying to explain as best I can.