Page Header

There are styles at top of head section you can un-comment to show the borders of the blocks that create this page structure.

Full-Width Header/Footer Stripes with Centered 1000px Wide Content

The Header/Footer Stripes set to 100% width.
But all content is still centered with 1000px width.
Hybrids of this example and the previous one are common. For example, a full-width header stripe but only a centered footer like in the previous example.