You're right, the default page size (A5) and font size are things that need to be easily customizable. I resisted adding many options to the CLI, but I think this is a good way to solve it? https://github.com/danburzo/percollate/issues/27
It's probably a good idea to not introduce flags like `--font-size 12p` or `--page A4` since it leads down a rabbit hole. (Where do you stop?). Directly passing down CSS seems appropriate here.
percollate pdf --output p.pdf https://github.com/danburzo/percollate
The font is gigantic and the page tiny. Barely get to the second headline on the first page.
And there is no way to tune this on the command line (yet).