Style Social Share Buttons

Hi, how do I style the Social Share Buttons? At the moment they are nested in a grid row with background set to green, but the actual icon of Facebook, Twitter, G+ etc.. are all in a mid grey colour. I would like to target them to be white.

I currently have the social share box nested in grid row with the id of #quins-contact and want to target the social icons.

Also I have a social share box further up the page, but don’t want to change anything with that as it is sitting nicely on a white background and looks fine.

I’ve tried this css code but I still can’t seem to target them… any ideas?

This is what I have so far…
#quins-contact .av-share-box a {color:#fff;}