The hex color #255c6c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#DAA393. The grayscale version is
#4F4F4F. A 20% lighter version of the original color is
#588F9F, and Hex
#002939 is the 20% darker color. If the color is saturated by 10%, you get
#215D6F. If the color is desaturated by 10%, the color
#295B69 is obtained.