The hex color #15185c is a dark color. The web-safe version is Hex
#000066. A complementary color is
#EAE7A3. The grayscale version is
#2E2E2E. A 20% lighter version of the original color is
#484B8F, and Hex
#000029 is the 20% darker color. If the color is saturated by 10%, you get
#131661. If the color is desaturated by 10%, the color
#171A57 is obtained.