The hex color #155f5e is a dark color. The web-safe version is Hex
#006666. A complementary color is
#EAA0A1. The grayscale version is
#464646. A 20% lighter version of the original color is
#489291, and Hex
#002C2B is the 20% darker color. If the color is saturated by 10%, you get
#106260. If the color is desaturated by 10%, the color
#1A5D5C is obtained.