Refs #19536; Changed the following:

- Enlarged column area and slightly reduced the column-two area so that the
  600px content area remains in place now that we no longer have a single body
  background color
- Added media queries that further modified the width of the columns
  when we have a smaller screen size
- Moved the viewlet-above-content with css above the content area since
  it shouldn't receive the content area background color