The hex color #243d9c is a dark color. The web-safe version is Hex
#333399. A complementary color is
#DBC263. The grayscale version is
#545454. A 20% lighter version of the original color is
#5770CF, and Hex
#000A69 is the 20% darker color. If the color is saturated by 10%, you get
#1F3BA3. If the color is desaturated by 10%, the color
#293F95 is obtained.