Help with note.css customization

[ulahcherubim]

Thanks everyone for this community's content. I find it useful.

I have a problem with Zotero's hidden preference note.css customization. I couldn't figure out how to change this to make editor space on the sides. I don't like it when it is full-screen and I want it to be more like Obsidian, Typora etc. in this manner. Can anyone help?