The hex color #3f46b3 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C0B94C. The grayscale version is
#686868. A 20% lighter version of the original color is
#7279E6, and Hex
#0C1380 is the 20% darker color. If the color is saturated by 10%, you get
#3B43BB. If the color is desaturated by 10%, the color
#4349AC is obtained.