How to make such a beautiful subload?

Question

PHP

Greetings,
the question arose how to implement the same beautiful page preload with a cube? https://www.xeovo.com/
I tried to do it simply with css and it didn’t work out very well. I'm not good at programming. I tried to find something, I came across this, but I didn’t really understand how to implement https://css-tricks.com/prefetching-preloading-preb...
I don’t even know how it’s called correctly in English. Preload?
Thank you!

Answer 1

Here are some cool preloaders and spinners for the site. You can see the source code there. Maybe it will help ...
beloweb.ru/novichkam/skachat-neskolko-krutyih-prel...