The hex color #cf21b0 is a dark color. The web-safe version is Hex
#CC3399. A complementary color is
#30DE4F. The grayscale version is
#8B8B8B. A 20% lighter version of the original color is
#FF54E3, and Hex
#9C007D is the 20% darker color. If the color is saturated by 10%, you get
#D616B4. If the color is desaturated by 10%, the color
#C82CAC is obtained.