The hex color #a3313d is a dark color. The web-safe version is Hex
#993333. A complementary color is
#5CCEC2. The grayscale version is
#5B5B5B. A 20% lighter version of the original color is
#D66470, and Hex
#70000A is the 20% darker color. If the color is saturated by 10%, you get
#AA2D3A. If the color is desaturated by 10%, the color
#9C3540 is obtained.