Firefox adds a blank page on printing - even with single empty page

[print2.txt](https://github.com/cognitom/paper-css/files/2605091/print2.txt)

Hi, Firefox, Edge and Explorer add a blank page on print preview and printing. The initial view on load looks fine, but when I hit "print" extra page is added.
Am I getting something wrong? Is there a way to deal with this?

@page { size: A4 }