How can I make an animated scanline for a gui

I cannot figure out how to achieve the arcade retro scanline effect for a GUI.
I have seen it in some games, animated even.
For example, as Nullxiety achieved: (It can also been seen in FNAF games)


This effect was achieved also animated, the lines moved vertically down the screen.
How can I achieve this?

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search up vhs effect on toolbox, there will be a whole vhs tape thing. I took out the frames from it and put it into my gui allowing me to create something like what you’re trying to achieve.

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