The hex color #310d9f is a dark color. The web-safe version is Hex
#330099. A complementary color is
#CEF260. The grayscale version is
#4A4A4A. A 20% lighter version of the original color is
#6440D2, and Hex
#00006C is the 20% darker color. If the color is saturated by 10%, you get
#2F07A8. If the color is desaturated by 10%, the color
#331396 is obtained.