The hex color #4b51e5 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#B4AE1A. The grayscale version is
#808080. A 20% lighter version of the original color is
#7E84FF, and Hex
#181EB2 is the 20% darker color. If the color is saturated by 10%, you get
#464CEF. If the color is desaturated by 10%, the color
#5056DB is obtained.