[Feature Request] Change code editor font size

[fishnux]

Is your feature request related to a problem? Please describe. Font size becomes smaller, background color changes: https://user-images.githubusercontent.com/29991194/189449918-c6978a1c-ab12-438b-afd5-681449c51344.mov

Describe the solution you'd like Ability to change font size (config variable is fine) Bonus: Keep same design as view-mode while editing

P.S.: Theme is dark because I'm using Dark Reader browser extension