CSS Stylesheet for printing documents

This older posting of @BLUEFROG describes a perfect solution to handle page margins in markdown printouts:

Thank you, Jim. Indeed, I wasn’t aware that with a customized page setting it is possible to define margins, whereas it is not possible to define them with the CSS stylesheet consistently for all pages. Now, I have a customized page setting for printing/converting markdown documents, and a standard page setting for printing other documents (PDF etc.)