Make Object Shrink on Hover

I am trying to animate objects to shrink when I hover over them and then grow back when I hover out. I can do hover states, but I cannot animate them that direction, I can only grow when hovering over and shrink when hovering out.

Context: I am creating a training module for health care to show to to check pupils with a pen light.

Here is a quick mock-up as an example:

Thanks for any help you can give.

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