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It uses Bing Maps and has this:

Jurij Stare, www.lightpollutionmap.info (v2.7.7) VIIRS Earth Observation Group, NOAA National Geophysical Data Center

Are you using a framework for your map or did you come up with those tooltip dissolving into tic-tac-toe animations yourself?

Typo corrected. I am not the creator and meant to write "It uses"