Image Caption Colors – can colors of hover overlay be changed in Montauk?

Hello,

I am using the Montauk template, in which the hover color for the image caption backgrounds is a dark grey.

Does anyone know if the default hover color value of image caption backgrounds and text can be changed?

I'd like it so that, rather than the caption overlay darkening with a light grey caption text, it fades to a white/grey with dark text when users hover the image?

Thanks for any thoughts you might have.

Ian