How can I make a circle on the ground that stays on the floor

The title is a bit confusing but let me further elaborate on what I am trying to accomplish
I want to make a move that does a pulse and it shows you where people are located for a short amount of time. I want there to be a small circle effect on the ground that expands for each pulse.

How can I create this circle to where its always on the ground? Something like this.
Normal Circle: (not what im trying to achieve)

The circle I want.
(excuse the poor drawings)
any and all help is greatly appreciated.

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