The hex color #3b19dd is a dark color. The web-safe version is Hex
#3300CC. A complementary color is
#C4E622. The grayscale version is
#666666. A 20% lighter version of the original color is
#6E4CFF, and Hex
#0800AA is the 20% darker color. If the color is saturated by 10%, you get
#3711E9. If the color is desaturated by 10%, the color
#3F21D1 is obtained.