The hex color #7b51cb is a dark color. The web-safe version is Hex
#6666CC. A complementary color is
#84AE34. The grayscale version is
#888888. A 20% lighter version of the original color is
#AE84FE, and Hex
#481E98 is the 20% darker color. If the color is saturated by 10%, you get
#7A4CD2. If the color is desaturated by 10%, the color
#7C56C4 is obtained.