The hex color #1d1d3f is a dark color. The web-safe version is Hex
#333333. A complementary color is
#E2E2C0. The grayscale version is
#282828. A 20% lighter version of the original color is
#505072, and Hex
#00000C is the 20% darker color. If the color is saturated by 10%, you get
#1C1C41. If the color is desaturated by 10%, the color
#1E1E3D is obtained.