multiple ramps?

Hi all,
I posted this problem before, but I can’t find it. So sorry to ask again.

I need to create a solid square 720 X 480. On all 4 sides, I need to have the color fade towards the middle. (like a radial but square)

I thought I would take a ramp node and fade in one side, then add 3 more ramps and do the other 3 sides.
This of course, does not work and I knew that, however, I can’t for the life of me remember the work around.

Has anyone have a work around?
Thanks,
lou

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