The hex color #3e3fd5 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C1C02A. The grayscale version is
#717171. A 20% lighter version of the original color is
#7172FF, and Hex
#0B0CA2 is the 20% darker color. If the color is saturated by 10%, you get
#393ADF. If the color is desaturated by 10%, the color
#4344CB is obtained.