The hex color #3f293c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0D6C3. The grayscale version is
#373737. A 20% lighter version of the original color is
#725C6F, and Hex
#0C0009 is the 20% darker color. If the color is saturated by 10%, you get
#40283D. If the color is desaturated by 10%, the color
#3E2A3B is obtained.