The hex color #25585c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#DAA7A3. The grayscale version is
#484848. A 20% lighter version of the original color is
#588B8F, and Hex
#002529 is the 20% darker color. If the color is saturated by 10%, you get
#215A5E. If the color is desaturated by 10%, the color
#29565A is obtained.