CSS/HTML whitespace problem with a div?

Charles

New member
I am creating a webpage using HTML and CSS.
I have three divs(top,middle,bottom). The middle div is then broken up into three divs. Im using percentages so that the user will always see the same page in any monitor setting.The main div has height 70% but doesn't use it all and the background color won't fill in the empty space. Is there any way to fix it?
 
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