I’m looking for a way to change the color of the “rulers” that appear under code folding points. You can see them faintly here:

Now keep in mine these are NOT the regular “ruler” lines you’ll find in the “Settings - Default” file. Sublime’s rulers go up and down the whole length of the document. These “fold rulers” appear at code fold points and disappear accordingly (for instance, between { } on different lines).
Basically, I want them to be more noticable. Is this possible?
Thanks!