animated lazy load placeholder

Hi

this is my website page : https://mwallpaper.ir/manchester-united-wallpapers.html

I use this css code to add fade effect to lazy load images, but I want to add a animated placeholder like below links :

https://jsfiddle.net/w6gk08Ly/6/

https://jamesinkala.com/blog/make-animated-content-placeholders-with-html-and-css/

any idea to do that?

The page I need help with: [log in to see the link]