The hex color #15424d is a dark color. The web-safe version is Hex
#003366. A complementary color is
#EABDB2. The grayscale version is
#373737. A 20% lighter version of the original color is
#487580, and Hex
#000F1A is the 20% darker color. If the color is saturated by 10%, you get
#12434F. If the color is desaturated by 10%, the color
#18414B is obtained.