After reviewing the articles which explained that when the sidebar goes under the content, it is usually due to a missing or extra div
causing the sidebar to wrap out of place, or because the width of the content or sidebar is too wide. Despite thoroughly checking my code, I am unable to identify where I have made an error.
For a full screen example, please view the fiddle here. JS Fiddle link: http://jsfiddle.net/nwZB4/