The hex color #b51a47 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#4AE5B8. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#E84D7A, and Hex
#820014 is the 20% darker color. If the color is saturated by 10%, you get
#BE1345. If the color is desaturated by 10%, the color
#AC2149 is obtained.