The hex color #d21e09 is a dark color. The web-safe version is Hex
#CC3300. A complementary color is
#2DE1F6. The grayscale version is
#535353. A 20% lighter version of the original color is
#FF513C, and Hex
#9F0000 is the 20% darker color. If the color is saturated by 10%, you get
#DF1902. If the color is desaturated by 10%, the color
#C52310 is obtained.