The hex color #a7302f is a dark color. The web-safe version is Hex
#993333. A complementary color is
#58CFD0. The grayscale version is
#575757. A 20% lighter version of the original color is
#DA6362, and Hex
#740000 is the 20% darker color. If the color is saturated by 10%, you get
#AF2C2B. If the color is desaturated by 10%, the color
#9F3433 is obtained.