The hex color #581a8c is a dark color. The web-safe version is Hex
#663399. A complementary color is
#A7E573. The grayscale version is
#555555. A 20% lighter version of the original color is
#8B4DBF, and Hex
#250059 is the 20% darker color. If the color is saturated by 10%, you get
#581492. If the color is desaturated by 10%, the color
#582086 is obtained.