The hex color #310d2f is a dark color. The web-safe version is Hex
#330033. A complementary color is
#CEF2D0. The grayscale version is
#242424. A 20% lighter version of the original color is
#644062, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#320B30. If the color is desaturated by 10%, the color
#300F2E is obtained.