The hex color #7b21cc is a dark color. The web-safe version is Hex
#6633CC. A complementary color is
#84DE33. The grayscale version is
#787878. A 20% lighter version of the original color is
#AE54FF, and Hex
#480099 is the 20% darker color. If the color is saturated by 10%, you get
#7B18D4. If the color is desaturated by 10%, the color
#7B2AC4 is obtained.