The hex color #3f1e5d is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C0E1A2. The grayscale version is
#3E3E3E. A 20% lighter version of the original color is
#725190, and Hex
#0C002A is the 20% darker color. If the color is saturated by 10%, you get
#3F1B60. If the color is desaturated by 10%, the color
#3F215A is obtained.