NOTE: the latest version is 3.0.1
The Black range of Colors.
rgba(0, 0, 0) #000000
rgba(105, 105, 105) #696969
rgba(128, 128, 128) #808080
rgba(169, 169, 169) #A9A9A9
rgba(192, 192, 192) #C0C0C0
rgba(0, 0, 0) #000000