Responsive and functional Markdown editor

What are you most proud of, and what would you do differently next time?

In the beginning I tried to do the html text formatting myself, but in the process I realised it was worth using a library to do it. I used "marked" and everything works nicely. I'm also happy with the way I've done document management, i.e. saving and so on. I don't know if my method is the clearest and most correct, but it seems to work pretty smoothly.

In general, Im happy with this project. I wanted to make a markdown editor before.

What challenges did you encounter, and how did you overcome them?

I managed to make the page itself responsive, only in some moments there are small nuances. Mainly problems from the fact that aside panel pushed content when opening.

What specific areas of your project would you like help with?

I would like to know if I can improve the accessibility of my markdown editor and some tips on how to organise js.