How can I change the border color of a picture inserted in a row?

Hi there!

I’ve been using the SiteOrigin page builder for WordPress and I’m quite happy with the results I’m getting.

I have a question though: I created a row and inserted a couple of pictures inside it, however, I still haven’t found where I can change the border color of the pics.

Please find below the picture of this issue to help you see the problem, I pointed the color I wanna change in blue:

http://s23.postimg.org/565ssw16j/Capture.png

Does anyone know how to change that color?

Thanks a lot!