The hex color #1d575c is a dark color. The web-safe version is Hex
#336666. A complementary color is
#E2A8A3. The grayscale version is
#454545. A 20% lighter version of the original color is
#508A8F, and Hex
#002429 is the 20% darker color. If the color is saturated by 10%, you get
#19595E. If the color is desaturated by 10%, the color
#21555A is obtained.