(Demo not for mobile devices)
The bullet color is the RGB equivalent of "#222" because that is the color that is set in the "white" theme for the headings.
This slide has a dark data-background attribute. The bullet color is the RGB equivalent of "#fff" because that is the color that is set in the "white" theme for the headings.
This slide has a light data-background attribute.
It has no effect on the Verticator bullets, because the theme is already light.