On icongnito I get the same and I made sure there was no extensions enabled there. Perhaps it's because of HighDPI?
I have just changed the HTML file with some advice from R.c in Discord. If you have the time, could you please refresh the page and tell me if the issue is solved?
I hate to say it, but it's not fixed, I shift reloaded as well. Feel free to write me on the discord if it'd be easier too.