Removing a dotted line from a theme

I’m playing around with a new theme called Journalcrunch.

Toward the top, there’s a horizontal line consisting of small teal-colored bullets. I’d like to remove this line, but I’m not sure how to go about it. (I’m a newb. Obviously. A gracious newb, though, nonetheless.)

Here’s a link to a JPG so you can see what I’m talking about:
https://media.smashingmagazine.com/cdn_smash/wp-content/uploads/uploader/images/journalcrunch/full_preview.jpg

To see it on a live site, go here: https://www.andrewbcopy.com

What’s the best way to remove this? Should I be looking to modify a PNG image file in the theme, or should I be turning my attention to some sort of PHP file?

Any help or insights are GREATLY appreciated!