The hex color #4037cd is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#BFC832. The grayscale version is
#6C6C6C. A 20% lighter version of the original color is
#736AFF, and Hex
#0D049A is the 20% darker color. If the color is saturated by 10%, you get
#3C32D7. If the color is desaturated by 10%, the color
#443CC3 is obtained.