The hex color #99011c is a dark color. The web-safe version is Hex
#990033. A complementary color is
#66FEE3. The grayscale version is
#3D3D3D. A 20% lighter version of the original color is
#CC344F, and Hex
#660000 is the 20% darker color. If the color is saturated by 10%, you get
#A20019. If the color is desaturated by 10%, the color
#90071F is obtained.