The hex color #21036c is a dark color. The web-safe version is Hex
#330066. A complementary color is
#DEFC93. The grayscale version is
#303030. A 20% lighter version of the original color is
#54369F, and Hex
#000039 is the 20% darker color. If the color is saturated by 10%, you get
#200072. If the color is desaturated by 10%, the color
#230866 is obtained.