Frontend CSS Article Editing is unusable

I emptied out the "Custom CSS" and the i noticed that the ".form-select, .custom-select" CSS Style from Template Creator conflicts with this dropdown box. :side:

for info I have released the 5.3.3 version which fixes the css issues
I have tested again by my side, and added few improvements that were not in my previous code

let me know

Hi,
I played a bit around and couldn't find any errors for now. 

But what i would change is to comment out "background: white;" and "color: black;" from the editor.css file.
What i also notices is that for some reason the H1,H2,H3,H4,H5,H6 front are not applied in the text editor.

there are some interfences with the headings fonts, but this is a small issue
it only happens in editing mode and is not blocking