How do I fix my CSS issue?

I'm simply trying to keep the body color from spilling inside the middle of my page (between the 2 sidebars), which I want to keep white.

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I'm kind of building this template from scratch and really want to do it the right way so that I can use it for other html projects as well. Could someone tell me what I'm doing wrong and what I could do better to make the css work?

Thanks!

URL here

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put this style for your container:

#container { 
   margin:0 auto; 
   width:900px;  
   background:white 
}

This is because by default background value for HTML element is transparent, so everything is see-through unless you specify otherwise