Why using this library makes printed PDF go out of A4 paper bounds?

[gitowiec]

I would like to use paper-css to style HTMLs invoices. It all perfectly looked on my monitor, I recalculated all units to mm (1mm == 3.78px). I print my PDFs using html-pdf node package which in turn uses phantomJS...
I don't know what to add more. There is no point of attaching CSS because it is simply as floats and divs with mm units set on them...

[ownadi]

I'd go with headless chrome instead of phantom. It's much more modern rendering engine and pretty easy to debug since the output should be the same as with cmd+p in your local browser.