Weird CSS Code in Socket

I can’t figure out how to get rid of a random line of css that is displaying in the Socket below the copyright.

This is what is showing in faint gray at the very bottom left:

footer_color strong {color: #222;}

I don’t have any CSS in the Quick CSS panel and I only have this in my Child Theme:

/*Add your own styles here:*/
.main_color strong {color: #222;}
footer_color strong {color: #222;}

This is what is in my Copyright field in the footer admin panel:

© 2015 Company Name [nolink]

So the CSS is getting placed there from somewhere I can’t track down. Would it be in the database somewhere?
I haven’t touched any of the parent theme files.

Thanks for any clues as to how to track this down. Links to the site and screenshots of the weird thing are below along with a temp login to the site.