suavedesign 0 Junior Poster in Training

I need help figuring out an issue I am having on my website, http://rejuvenateusa.org/home.html.
When the site is at full screen on my browser, it looks okay, but when I minimize my screen and get a scroll bar on the bottom, the content overflows onto the body of the site, instead of stretching to fill up the screen. I want the header background (with the nav) to stretch, as well as the main content background, and footer background. Why do those backgrounds get cut short, instead of stretching?
Please help...
Thank you!

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