The .content div provides overall page margins and a max width, and is already nested inside the nav menus (this allows the nav background to fill the full width of the page.
The main content area should be structured the same way, so we can have flexibility needed to allow some screens to use the full page.
This doesn't seem to change the layout of any screens in the admin interface.
Now the table content can stretch full width
And provide a basic hover state for most other buttons.
The pagination button hover and active states will need updating.
The darker background colour sometimes wraps a whole table (eg products table).
Individual files may be copied in order to replace the old files.
NOTE: these may need manually re-syncing. If any of the copied files have changed on master in the meantime, we'll need to manaully review to consider bringing those changes to the new design.
