The hex color #155c6e is a dark color. The web-safe version is Hex
#006666. A complementary color is
#EAA391. The grayscale version is
#4A4A4A. A 20% lighter version of the original color is
#488FA1, and Hex
#00293B is the 20% darker color. If the color is saturated by 10%, you get
#105E72. If the color is desaturated by 10%, the color
#1A5A6A is obtained.