The hex color #c74c3d is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#38B3C2. The grayscale version is
#707070. A 20% lighter version of the original color is
#FA7F70, and Hex
#94190A is the 20% darker color. If the color is saturated by 10%, you get
#D04838. If the color is desaturated by 10%, the color
#BE5042 is obtained.