The hex color #3f4367 is a dark color. The web-safe version is Hex
#333366. A complementary color is
#C0BC98. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#72769A, and Hex
#0C1034 is the 20% darker color. If the color is saturated by 10%, you get
#3E426A. If the color is desaturated by 10%, the color
#404464 is obtained.