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Is your feature request related to a problem? Please describe.
Currently Nextcloud ignores the browser setting for the primary font size and defines a default font size of 15px. This means, nevertheless, which default font size I set as a user, all apps base on 15px font size.

Out of accessibility reasons I wonder, if it would be a good decision to get away from fixed px definitions to a relative font size by using rem and em.

Describe the solution you'd like

• Define a default font-size of 16px as used aqs the default by most of the browsers.
• Change font size definitions from px to rem
• Change any width (and maybe heights) to be calculated from the font size
• Same for margins, paddings and other elements like borders
• Define media queries by em (or rem, if safari has no more issues with that)
• Adopt this to nextcloud-vue and other libs

Additional context
This means some good planning and communication, since apps have to follow this change.