Is it possible to make moving gradient?

I have a donation board in my game, and to make it more interesting I put gradient on the four highest donations. To go further with this, I would like to make the gradient move. I have done this before with outline by just rotating the gradient, but that doesn’t work here as I would like to do it horizontally. Does anyone know how I could possibly do this? I appreciate any help. Thanks!
Screenshot (92)

This Devforum post could help