I want to change the font size in the editor.

[hiragiyayoi]

Thank you for using HackMD, I find HackMD easy to use for describing markdowns. However, I have one complaint. That is that it lacks too many features for a text editor. Many features are missing, but we would especially like to be able to freely change only the font size in the editor. This would allow for proper font size when using a 4k monitor or a 27" monitor at 1080p. Please improve HackMD to make it even easier to use.
If you are going to add a playful element to the text editor, you should first implement what is necessary for an editor and then do it last. There are many issues, but please don't add unnecessary features when so many issues exist. Please do not reduce the minimum functionality for the sake of simplicity.