The hex color #3e3fd8 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C1C027. The grayscale version is
#727272. A 20% lighter version of the original color is
#7172FF, and Hex
#0B0CA5 is the 20% darker color. If the color is saturated by 10%, you get
#393AE2. If the color is desaturated by 10%, the color
#4344CE is obtained.