The hex color #30409c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#CFBF63. The grayscale version is
#595959. A 20% lighter version of the original color is
#6373CF, and Hex
#000D69 is the 20% darker color. If the color is saturated by 10%, you get
#2C3DA3. If the color is desaturated by 10%, the color
#344395 is obtained.