The hex color #7f101c is a dark color. The web-safe version is Hex
#660033. A complementary color is
#80EFE3. The grayscale version is
#393939. A 20% lighter version of the original color is
#B2434F, and Hex
#4C0000 is the 20% darker color. If the color is saturated by 10%, you get
#860C19. If the color is desaturated by 10%, the color
#78141F is obtained.