The hex color #300d0d is a dark color. The web-safe version is Hex
#330000. A complementary color is
#CFF2F2. The grayscale version is
#191919. A 20% lighter version of the original color is
#634040, and Hex
#000000 is the 20% darker color. If the color is saturated by 10%, you get
#320C0C. If the color is desaturated by 10%, the color
#2E0E0E is obtained.