Rounded corners

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Using your plugin at: http://bcmoaa.org/chapter-info/chapter-officers/
As you can see square corners. Want to round the corners., i.e. border-radius: 20px;
I am using Genesis – NewsPro. By entering img {border-radius: 20px; } in Appearance — Customize — Additional CSS the corners are rounded. HOWEVER, as expected, this is a global rounding for the entire site. Where do I put the rounding CSS code to JUST round the staff pictures at the above URL using your plugin?
Would like to do this without modifying the plugin code as updates would wipe this code.

THANKS – Ken Cooper