The hex color #1b51c5 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#E4AE3A. The grayscale version is
#666666. A 20% lighter version of the original color is
#4E84F8, and Hex
#001E92 is the 20% darker color. If the color is saturated by 10%, you get
#144FCF. If the color is desaturated by 10%, the color
#2253BB is obtained.