The hex color #3C37A8 is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C3C857. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#6F6ADB, and Hex
#090475 is the 20% darker color. If the color is saturated by 10%, you get
#3933AF. If the color is desaturated by 10%, the color
#3F3BA1 is obtained.