How do I change the editor's default font size?

I’m trying to use space-style to change the editor’s default font size, but none of the attributes I’m trying seem to work. Things like --font-size, --editor-font-size, stuff I’m looking at using Inspect Element, etc…

What attribute do I need to change to change the editor’s default font size?

Sorry if this is a nooby question, but I can’t find any answers from searching Google or the forums.

When inspecting the lines I see this CSS:

#sb-main .cm-editor {
  font-size: 18px;
  ...
}

So it looks like the font-size is not set using a variable.
You can override this in your space-style then using:

#sb-main .cm-editor {
  font-size: 24px;
}

That did it. Thank you.