The hex color #3a57cf is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C5A830. The grayscale version is
#757575. A 20% lighter version of the original color is
#6D8AFF, and Hex
#07249C is the 20% darker color. If the color is saturated by 10%, you get
#3454D8. If the color is desaturated by 10%, the color
#405AC6 is obtained.