The hex color #6c788f is a dark color. The web-safe version is Hex
#666699. A complementary color is
#938770. The grayscale version is
#7C7C7C. A 20% lighter version of the original color is
#9FABC2, and Hex
#39455C is the 20% darker color. If the color is saturated by 10%, you get
#6A7891. If the color is desaturated by 10%, the color
#6E788D is obtained.