Changing category link folder color

Using advice in another post here I have used php in my child theme to move my category link to above the post title in single posts. I would just like to know the css to change the folder icon colour now. You can see it here, the folder above the post title and to the left of the cat link is black, I'd like to change it to grey:

https://www.notesinspanish.com/2008/02/27/intermediate-spanish-podcast-46-la-nueva-inmigracion/

Thanks, Ben