Custom CSS

Hi guys, trying to edit this string:

<div class="g-list-flex__item" data-ed-post-counter="" data-id="4">0 posts</div>

How do I apply a color to the codeline above?
I have edited the other elements aboce this with something like:

#ed .g-list-flex__item {
color: #2ba3d4:

And that works.

In terms of the grey "folder" icons - can they be recolored or replaced?

Thanks

Dean