When I run your code, I pass all tests. Here are some things to check:
Are you on a supported browser version? - freeCodeCamp supports the most recent versions of Chrome, Firefox, Safari, and Edge
Does your browser have its own font size settings? - Some OSes (especially for Apple products) will set font sizes when you install a browser.
Do you have any extensions running? - Styling extensions may alter the CSS of pages and privacy extensions may prevent scripts (like the tests) from running correctly.
Have you tried resetting the challenge and pasting your solution in before rerunning tests? - Every once in a while your session can get in a weird state and cause atypical behavior.