The hex color #21078c is a dark color. The web-safe version is Hex
#330099. A complementary color is
#DEF873. The grayscale version is
#3C3C3C. A 20% lighter version of the original color is
#543ABF, and Hex
#000059 is the 20% darker color. If the color is saturated by 10%, you get
#1E0294. If the color is desaturated by 10%, the color
#240C84 is obtained.