How to create a space for dropping circles like in Salesforce Cards


I would like to create an area that I can “snap” circles into like in Salesforce Cards shapes.  In the image below, I can drag and drop a circle into the gray spaces and they “snap” into the card with the right dimensions and are automatically “grouped” to the card so that when I drag and drop, the snapped images move along with the card.  How do I create these gray circles myself?

 Here’s the above card with a few circles snapped in:


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