Not sure that you can see, (some of what you see there is shadow) but the very bottom edging is out of a dark charcoal. I didn't like any of the near color choices, so went with the dark neutral. Perhaps you can see it better in this photo:
Seems I am always throwing items on the neighbor's fence for photos. He's never asked, but I bet he wonders about my sanity. I was spinning out on my patio the other day, and my other next door neighbor finally came over and asked what I was doing. I had to laugh, as her nearly grown sons had been spending a great deal of time in their backyard, but gazing over into mine. They finally sent mom over to find out what was going on.