The hex color #1a102c is a dark color. The web-safe version is Hex
#330033. A complementary color is
#E5EFD3. The grayscale version is
#1D1D1D. A 20% lighter version of the original color is
#4D435F, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#1A0F2E. If the color is desaturated by 10%, the color
#1A112A is obtained.