The hex color #b7372c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#48C8D3. The grayscale version is
#5E5E5E. A 20% lighter version of the original color is
#EA6A5F, and Hex
#840400 is the 20% darker color. If the color is saturated by 10%, you get
#C03327. If the color is desaturated by 10%, the color
#AE3B31 is obtained.