The hex color #b4378c is a dark color. The web-safe version is Hex
#CC3399. A complementary color is
#4BC873. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#E76ABF, and Hex
#810459 is the 20% darker color. If the color is saturated by 10%, you get
#BA308E. If the color is desaturated by 10%, the color
#AF3E8B is obtained.