I'm seeing it as a very faint gray outline. My guess is that the svbtle theme is using the shadow DOM to customize scrollbar appearance (couldn't find where he'

I'm seeing it as a very faint gray outline. My guess is that the svbtle theme is using the shadow DOM to customize scrollbar appearance (couldn't find where he's doing it in a cursory search of the applied styles though). Check out Chris Coyier's article on the subject here: http://css-tricks.com/custom-scrollbars-in-webkit/ http://css-tricks.com/custom-scrollbars-in-webkit/