The hex color #3f292c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#C0D6D3. The grayscale version is
#313131. A 20% lighter version of the original color is
#725C5F, and Hex
#0C0000 is the 20% darker color. If the color is saturated by 10%, you get
#40282B. If the color is desaturated by 10%, the color
#3E2A2D is obtained.