The hex color #b7001c is a dark color. The web-safe version is Hex
#CC0033. A complementary color is
#48FFE3. The grayscale version is
#464646. A 20% lighter version of the original color is
#EA334F, and Hex
#840000 is the 20% darker color. If the color is saturated by 10%, you get
#C20018. If the color is desaturated by 10%, the color
#AC0720 is obtained.