The hex color #df212b is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#20DED4. The grayscale version is
#646464. A 20% lighter version of the original color is
#FF545E, and Hex
#AC0000 is the 20% darker color. If the color is saturated by 10%, you get
#EB1A25. If the color is desaturated by 10%, the color
#D32831 is obtained.