The hex color #3147d0 is a dark color. The web-safe version is Hex
#3333CC. A complementary color is
#CEB82F. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#647AFF, and Hex
#00149D is the 20% darker color. If the color is saturated by 10%, you get
#2B43DA. If the color is desaturated by 10%, the color
#374BC6 is obtained.