The hex color #3f363b is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0C9C4. The grayscale version is
#3B3B3B. A 20% lighter version of the original color is
#72696E, and Hex
#0C0308 is the 20% darker color. If the color is saturated by 10%, you get
#3F363B. If the color is desaturated by 10%, the color
#3F363B is obtained.