The hex color #155b5e is a dark color. The web-safe version is Hex
#006666. A complementary color is
#EAA4A1. The grayscale version is
#454545. A 20% lighter version of the original color is
#488E91, and Hex
#00282B is the 20% darker color. If the color is saturated by 10%, you get
#105D61. If the color is desaturated by 10%, the color
#1A595B is obtained.