The hex color #3f61d9 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C09E26. The grayscale version is
#7E7E7E. A 20% lighter version of the original color is
#7294FF, and Hex
#0C2EA6 is the 20% darker color. If the color is saturated by 10%, you get
#395EE2. If the color is desaturated by 10%, the color
#4564D0 is obtained.