The hex color #3f33cb is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#C0CC34. The grayscale version is
#6A6A6A. A 20% lighter version of the original color is
#7266FE, and Hex
#0C0098 is the 20% darker color. If the color is saturated by 10%, you get
#3B2ED5. If the color is desaturated by 10%, the color
#4338C1 is obtained.