Is your feature request related to a problem?

Usually websites have full width header & footer just like this:

This is useful, especially in Hugo because it allows user to customize header & footer just by using css file or custom_head.html

But the header and footer of this theme just follows the content width (720px).

This will makes the modification more difficult because you must also modifies baseof.html to create container class.

Describe the solution you'd like

Make the header and footer wider by default, but keeps the header and footer content align with the body content just as usual. This don't change the visual appearance of the theme while also makes the theme more flexible to customize.

Describe alternatives you've considered

No response

Additional context

No response