How to make hidden content pop up only when an object is hovered over with mouse

There may come a time when you need to create content that you want to have stay hidden until an object or image is hovered over with the mouse. An example of a way to use this is in making a map with map pins that when the mouse hovers over a map pin, it creates a pop up with information about that location or a project that was completed for that location. Just follow these steps to make hidden content pop up when an object or image is hovered over with the mouse on your WordPress site.
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