The hex color #451b9f is a dark color. The web-safe version is Hex
#333399. A complementary color is
#BAE460. The grayscale version is
#555555. A 20% lighter version of the original color is
#784ED2, and Hex
#12006C is the 20% darker color. If the color is saturated by 10%, you get
#4315A6. If the color is desaturated by 10%, the color
#472198 is obtained.