How to deal with the font size on the site in different operating systems?

Question

Fonts

Hello! This is my first time building a website and I have a question.
In styles, I prescribe all the appropriate fonts for different systems, I indicate the size in percent. When opening a page in a Linux browser, the fonts are displayed with a slightly larger size than in Windows, as a result they crawl out of the margins ... How to deal with this problem?

Answer 1

Bring styles in different browsers to a single style (normalize.css, reset.css) and set the base font in pixels.