@keyframes to animate an object

Hi, how can I put this animation

onto this

I know I can’t write it as it because it’s set on the body and it’s a background image and I wan to keep the background image I already have.
I tried everything , and although I managed to put the “ufo” image on my survey, the animation didn’t work.

its not set on the body, its set on the h1, you should be able to apply as is