The hex color #31359f is a dark color. The web-safe version is Hex
#333399. A complementary color is
#CECA60. The grayscale version is
#575757. A 20% lighter version of the original color is
#6468D2, and Hex
#00026C is the 20% darker color. If the color is saturated by 10%, you get
#2D32A6. If the color is desaturated by 10%, the color
#353898 is obtained.