Placing a button on top of a word in a marker.

Hi All

thanks so much for reading this question. 

I've got a marker that opens up with some info. some of that info needs to be explained further and I thought adding a button over a particular word that would then lead to a Lightbox would be good. 

I'm having problems getting the button to show on top of the word within the marker. getting the light box to appear is fine. its just the button I'm having issues with. 

Any ideas?  thank you so much. 

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