The hex color #313b3c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#CEC4C3. The grayscale version is
#383838. A 20% lighter version of the original color is
#646E6F, and Hex
#000809 is the 20% darker color. If the color is saturated by 10%, you get
#303B3C. If the color is desaturated by 10%, the color
#323B3C is obtained.