chatgpt giving you a banger piece of code but when you ask for help on fixing one small bug it reverts it back to being ugly as hell

I don't know anything about coding but last month I asked ChatGPT to write me a HTML with balls bouncing on a drawn surface. at first it was glitchy as hell but I told it about the problems and it ended up giving me one that worked surprisingly well

where did you paste the code

made a page on blogger.com and pasted it there