The hex color #51363c is a dark color. The web-safe version is Hex
#663333. A complementary color is
#AEC9C3. The grayscale version is
#414141. A 20% lighter version of the original color is
#84696F, and Hex
#1E0309 is the 20% darker color. If the color is saturated by 10%, you get
#53353C. If the color is desaturated by 10%, the color
#4F373D is obtained.