Add particles as a background

[fncalderong]

Hello everyone, I would like to add a background of particles on the login page.
I'm trying to use library(particlesjs). was able to add here but not in background see attachment.

Thanks in advance.

[Tixierae]

I have no clue as far as what the answer might be, but if you want to receive help from other users, make sure to add a minimal reproducible example.