Hey there this CSS .user-css { font-size: 18px; } should not really be affecting much - have you talked to the css-help channel on discord?

I have, they told me to reach out to here, and I have tried multiple different font sizes, from 18 to 20 to 40   I had someone else reproduce it before sending in this bug and the same thing happened for them

They did actually find a way for me to fix it afaict, but they recommended I still reach out.   This is what they said Hanhula: Your theme is currently hardcoding it to a pixel value, so making it this should have it scale appropriately. [3:58 AM] There are quuiiiiite a lot of places this happens on your theme, so instead of fixing them yourself, it might be best to ask in your bug report for someone to convert the pixel values to EM so that the base font size box works.

Thank you for the information we will slate this for an update :)