The hex color #d4391c is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#2BC6E3. The grayscale version is
#636363. A 20% lighter version of the original color is
#FF6C4F, and Hex
#A10600 is the 20% darker color. If the color is saturated by 10%, you get
#DF3515. If the color is desaturated by 10%, the color
#C93D23 is obtained.