The hex color #31989c is a dark color. The web-safe version is Hex
#339999. A complementary color is
#CE6763. The grayscale version is
#777777. A 20% lighter version of the original color is
#64CBCF, and Hex
#006569 is the 20% darker color. If the color is saturated by 10%, you get
#2A9BA0. If the color is desaturated by 10%, the color
#389598 is obtained.