The hex color #1900dd is a dark color. The web-safe version is Hex
#0000CC. A complementary color is
#E6FF22. The grayscale version is
#525252. A 20% lighter version of the original color is
#4C33FF, and Hex
#0000AA is the 20% darker color. If the color is saturated by 10%, you get
#1300EB. If the color is desaturated by 10%, the color
#1F08CF is obtained.