The hex color #311a8c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#CEE573. The grayscale version is
#484848. A 20% lighter version of the original color is
#644DBF, and Hex
#000059 is the 20% darker color. If the color is saturated by 10%, you get
#2F1593. If the color is desaturated by 10%, the color
#331F85 is obtained.