can some one help me with this?

hello! I was just trying to make my page look better and I think I succeeded! (mostly) I wanted to add this checkerboard gif over the background colour is that possible? and if so how would I go about doing it?

(heres the gif) https://media.discordapp.net/attachments/998369826609319976/1018363712341557348/checkertranslucent.gif