Why is the font size on the pdf version of a webpage smaller than the font size on the webpage itself?

If we were to visit the lorem ipsum site https://www.lipsum.com/ on windows 10 chrome and use chrome's Microsoft Print to PDF feature, the font size in the pdf and webpage are different. Attached image as example: On the left is the PDF version of the webpage viewed through Adobe Acrobat Reader DC at a zoom level of 100% and on the right is the actual webpage itself. Why does this happen and how do I make the font size in the PDF identical to it's web counterpart?