it’s nice to see people caring about less obvious problems in web development such as providing proper CSS so that users can print the page or parts of the website. Whenever I have to print an invoice, I’m not physically printing it but I save it as PDF file. Creating print stylesheets is mostly about adding more responsiveness to your site so people can save it as PDF and still read it nicely. Interestingly, I find that for most websites it’s no hard work to make them look nice on printed out papersheets but yet, so many people forget about it. If you have information on your website that people might want to save or print, such as invoices, long articles or a 2-factor backup code, please consider adding some nice stylesheet for this use-case. Make your users happy.