The hex color #3a3cc9 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C5C336. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#6D6FFC, and Hex
#070996 is the 20% darker color. If the color is saturated by 10%, you get
#3537D2. If the color is desaturated by 10%, the color
#3F41C0 is obtained.