@Denjohnson Red or green are not options you should really choose for anything because of accessibility.  Color blind folks cannot see either of those colors.  You may be able to target a friendly, accessible color via CSS.  I would talk with your CSM and let us know what you find.

Is changing the color an option at all? Does it require CSS?

@Denjohnson You may be able to target a friendly, accessible color via CSS.  I would talk with your CSM and let us know what you find.

Here is what was shared and you can change to an accessible color 

.image__zone{ border:3px Solid red;}

@Denjohnson and All, should you use the Highlight page type, it now looks this for us and our Panoramas.  I changed the weight of the outline from 4 to 6 and changed the outline color from black to gold.  Did not use red or green for accessibility reasons.  You can also now click anywhere inside the gold box and not just have to click the "i". Enjoy being in the know.