How do I remove a dotted border from all images when they're clicked.

[adamadamadam]

I thought this would be fairly simple to do. Whenever an image that is linking somewhere is clicked an orange dotted border is shown. I'd like to remove it.

So, I checked in the "All Style Options" for that theme and there's no mention of the word 'dotted'. I did a search for the orange colour code it's using and all it is attached to are links - and those have an addition of "Underline" whenever clicked, no borders.

Any idea where I may look to remove this?

Thanks!