The hex color #3f353f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0CAC0. The grayscale version is
#3C3C3C. A 20% lighter version of the original color is
#726872, and Hex
#0C020C is the 20% darker color. If the color is saturated by 10%, you get
#3F343F. If the color is desaturated by 10%, the color
#3F363F is obtained.