The hex color #6b3c99 is a dark color. The web-safe version is Hex
#663399. A complementary color is
#94C366. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#9E6FCC, and Hex
#380966 is the 20% darker color. If the color is saturated by 10%, you get
#6B379E. If the color is desaturated by 10%, the color
#6B4194 is obtained.