The hex color #721B5D is a dark color. The web-safe version is Hex
#663366. A complementary color is
#8DE4A2. The grayscale version is
#4E4E4E. A 20% lighter version of the original color is
#A54E90, and Hex
#3F002A is the 20% darker color. If the color is saturated by 10%, you get
#76165F. If the color is desaturated by 10%, the color
#6E205C is obtained.