The hex color #3d3cdd is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C2C322. The grayscale version is
#727272. A 20% lighter version of the original color is
#706FFF, and Hex
#0A09AA is the 20% darker color. If the color is saturated by 10%, you get
#3837E8. If the color is desaturated by 10%, the color
#4241D2 is obtained.