Can someone share some codes for animated backgrounds in HTML Markup that I can add to my pages ???¿

Question

Looking for Animated Background for use on my Pages I create

Answer 1

I think you can google it. You will get your answer there. However, I found two interesting web site for your question.
https://bashooka.com/coding/web-background-animation-effects/ (must visit)
https://freefrontend.com/css-animated-backgrounds/
(also good)
These must give you some ideas.
On the first website, you can click on images to see them moving and their amazing codes.....
My favourite one is that of exploring space and the rainy one so, must see them

Answer 2

https://code.sololearn.com/WYd7cAEJxQ5P/?ref=app