Locating misplaced CSS

Kind of an embarrassing questions. There’s a misplaced bit of CSS at the bottom left of my site (see here: http://www.wcql.com/) and I’d like to delete it, but I can’t remember or locate it. Using the inspect tools in chrome I can see it, but I still don’t know where it would be.

Is that something that can be determined by looking at the source?

Also, an irrelevant, but short question:

Should I have copied all the template, content, sidebar.php, etc files from my parent to my child theme? I’m thinking that was a mistake. The Style.css is set up correctly…and everything’s working, but was that wrong?

Do these files overwrite the control of the parent theme files?

Feeling like a major noob today.

Thanks,

Jason