
Click on CSS option to enter the css code then save the file for result.
CSS Code:
[data-gs-id="paaefjd9wx8evb1hh7rqqia4i"] .grid-stack-wrapper{
border-radius:50% !important;
overflow:hidden;
}
//data-gs-id is the unique id of each panel
Here is the output for the above CSS code.

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