Design Print Layout / Grid in HTML

I use DayOne for a journal of my familiy. There is an export script available based on python and Jinja templates. I now want to have a HTML template which creates a html which fits a DIN A4 paper when exporting/printing in Google chrome as PDF. The grid should look like this - [login to view URL] Please find attached the current html default file and a generated html example (Archive [login to view URL]) I use the following dayone_export script for export.