The hex color #312b4c is a dark color. The web-safe version is Hex
#333333. A complementary color is
#CED4B3. The grayscale version is
#383838. A 20% lighter version of the original color is
#645E7F, and Hex
#000019 is the 20% darker color. If the color is saturated by 10%, you get
#302A4E. If the color is desaturated by 10%, the color
#322C4A is obtained.