font-size definitions should use relative units

[thibaudcolas]

There are a large number of font-size definitions set in px values across the project. This is problematic for users of browser-level text zooming. All those definitions should be replaced with equivalent rem values.

[Aarthy153]

Hi, I would like to work on this issue. Can I get assigned?

[zerolab]

@Aarthy153 thanks for the interest. We do not assign issues to non-core folk. Feel free to add a note that you are working on the issue, then open a PR.

[kituuu]

@thibaudcolas @zerolab, can I work on it if the issue is still not fixed?

[thibaudcolas]

Anyone can work on anything, please read the comment right above yours.