The hex color #de180c is a dark color. The web-safe version is Hex
#CC0000. A complementary color is
#21E7F3. The grayscale version is
#565656. A 20% lighter version of the original color is
#FF4B3F, and Hex
#AB0000 is the 20% darker color. If the color is saturated by 10%, you get
#EC1205. If the color is desaturated by 10%, the color
#D01E13 is obtained.