The hex color #3f68c3 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C0973C. The grayscale version is
#797979. A 20% lighter version of the original color is
#729BF6, and Hex
#0C3590 is the 20% darker color. If the color is saturated by 10%, you get
#3966CA. If the color is desaturated by 10%, the color
#456ABC is obtained.