The hex color #31474c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#CEB8B3. The grayscale version is
#414141. A 20% lighter version of the original color is
#647A7F, and Hex
#001419 is the 20% darker color. If the color is saturated by 10%, you get
#2F484D. If the color is desaturated by 10%, the color
#33464B is obtained.