Is there a stylesheet for the Invoice pdf v2.2?

Hi I have searched the forum but can't find any help on how to make just minor changes to the way the Invoice prints.

Is there a stylesheet that would give me control over the layout?

I found that I had to amend the source code to change the layout / style of the invoices.

Nop uses some 3rd party code to create the PDF's, and its very tables based in its layout.