The hex color #3f398f is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C0C670. The grayscale version is
#585858. A 20% lighter version of the original color is
#726CC2, and Hex
#0C065C is the 20% darker color. If the color is saturated by 10%, you get
#3D3695. If the color is desaturated by 10%, the color
#413C89 is obtained.