Design and Layout is much easier once an overall framework is made and then simply adjusted from there.
This is the two-column layout page. By simply adding two sub-content divs within the overall content div, I didn't have to make any major adjustments.
When it came to applying the CSS, I was able to use the same stylesheet because in the one-column layout, it didn't have the two sub-content divs in the HTML5, so the background colors weren't applied.