The hex color #31325c is a dark color. The web-safe version is Hex
#333366. A complementary color is
#CECDA3. The grayscale version is
#404040. A 20% lighter version of the original color is
#64658F, and Hex
#000029 is the 20% darker color. If the color is saturated by 10%, you get
#30315F. If the color is desaturated by 10%, the color
#323359 is obtained.