Describe the feature and the current behavior/state

There are two circular and one rectangular shapes for the magnifier to choose from in the config. The circular one can be with or without shadow, but the rectangular one is always without shadow. I want to add the shadow option for the rectangular magnifier. Sreenshot from the POC:

Who will benefit with this feature?

All who would prefer the rectangular magnifier for practical reasons but find the shadow design of the circular one more attractive.

Any Other info

Questions below