The hex color #6d878c is a dark color. The web-safe version is Hex
#669999. A complementary color is
#927873. The grayscale version is
#808080. A 20% lighter version of the original color is
#A0BABF, and Hex
#3A5459 is the 20% darker color. If the color is saturated by 10%, you get
#6B888D. If the color is desaturated by 10%, the color
#6F868B is obtained.