The hex color #3f5cec is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#C0A313. The grayscale version is
#828282. A 20% lighter version of the original color is
#728FFF, and Hex
#0C29B9 is the 20% darker color. If the color is saturated by 10%, you get
#3858F7. If the color is desaturated by 10%, the color
#4660E1 is obtained.