The hex color #3f0b67 is a dark color. The web-safe version is Hex
#330066. A complementary color is
#C0F498. The grayscale version is
#3B3B3B. A 20% lighter version of the original color is
#723E9A, and Hex
#0C0034 is the 20% darker color. If the color is saturated by 10%, you get
#3F066B. If the color is desaturated by 10%, the color
#3F1063 is obtained.