Change selected text font size (not headers)

Is there any way of changing the font size of the selected text quickly without using headers?

Sure I can set up a css and wrap my text by typing the whole <div id=..> </div> shebang but I’m looking for shortcut that would just apply that on the fly so it doesn’t interrupt workflow.

Note that what I am not looking to do is change the default text size for all notes.

Rather, I’m looking for something where you can just press ctrl+shift+> or < to decrease the font size of selected text apart from the rest of the note. Say, every time you press that, it adds or subtracts 0.5em to the font size.