The hex color #6c6fa9 is a dark color. The web-safe version is Hex
#666699. A complementary color is
#939056. The grayscale version is
#818181. A 20% lighter version of the original color is
#9FA2DC, and Hex
#393C76 is the 20% darker color. If the color is saturated by 10%, you get
#6A6DAD. If the color is desaturated by 10%, the color
#6E71A5 is obtained.