Can't edit textbox animated arrow

I have a textbox with a little down arrow on the right side of it that bounces up and down. It was copied from a sample course the client provided. Now I'm working on a new course and when copied over (or in general) I can change the background color and font color on the rest of the text box but not the arrow color or the background of the box the arrow is in. Does anyone know how to do this?

 

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