Looking to combine html files into single pdf

I want to print (as a book) and ship my browser reading list to myself once a month. To do that, I need to upload it as a pdf file.

Using firefox's readability cli tool, I've managed to print urls to individual html files. But there doesn't seem to be any reliable (something that maintains formatting) way to combine those html files into a single pdf.

I tried wkhtmltopdf but it screws up formatting and style and turns it into something I wouldn't want to read.

Anyone have ideas?