Export to PDF to keep the background dark (default)

Feature requests
1

Use case or problem

Export to PDF uses white background even if my theme is dark.

Proposed solution

Have PDFs look like the documents they are made from - with the same background colour (not ideal for printing, so ideally, this should be optional, perhaps not even default).

Current workaround (optional)

Related feature requests (optional)

2

PDF documents are for print, therefore the white background.

If you want only a PDF, then css should be able to export dark themes