The hex color #21047c is a dark color. The web-safe version is Hex
#330066. A complementary color is
#DEFB83. The grayscale version is
#363636. A 20% lighter version of the original color is
#5437AF, and Hex
#000049 is the 20% darker color. If the color is saturated by 10%, you get
#1F0083. If the color is desaturated by 10%, the color
#230975 is obtained.