The hex color #186b5c is a dark color. The web-safe version is Hex
#006666. A complementary color is
#E794A3. The grayscale version is
#4A4A4A. A 20% lighter version of the original color is
#4B9E8F, and Hex
#003829 is the 20% darker color. If the color is saturated by 10%, you get
#136E5E. If the color is desaturated by 10%, the color
#1D685A is obtained.