The hex color #3d29dd is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C2D622. The grayscale version is
#6C6C6C. A 20% lighter version of the original color is
#705CFF, and Hex
#0A00AA is the 20% darker color. If the color is saturated by 10%, you get
#3822E8. If the color is desaturated by 10%, the color
#4230D2 is obtained.