This HTML, CSS, JS code is not working on iphone. Help please

Question

This code by Rull Deef 🐺 is not working on iphone. Kindly help.

https://code.sololearn.com/WI5g5s4rTYmb/?ref=app

Answer 1

I think people have said that Ios updates are quite behind

Answer 2

I tried changing the CSS background color property to 'gray', and for a moment we see some action happening in a grayscale color, but again the screen goes black