The hex color #155d6e is a dark color. The web-safe version is Hex
#006666. A complementary color is
#EAA291. The grayscale version is
#4B4B4B. A 20% lighter version of the original color is
#4890A1, and Hex
#002A3B is the 20% darker color. If the color is saturated by 10%, you get
#105F72. If the color is desaturated by 10%, the color
#1A5B6A is obtained.