How to erase the background with the cursor in order to reveal what's underneath?

Hello guys!
I was wondering if any of you know how to make it so when you go over a picture with the cursor it gets erased and what’s underneath shows?
Like this website has it in the beginning when you first open it https://dateagle.art
Whether its code or anything whatever you think might work pls let me know because I have been trying to figure it our for way too long :))
Thanks!!!