The hex color #dd2f23 is a dark color. The web-safe version is Hex
#CC3333. A complementary color is
#22D0DC. The grayscale version is
#656565. A 20% lighter version of the original color is
#FF6256, and Hex
#AA0000 is the 20% darker color. If the color is saturated by 10%, you get
#E92A1C. If the color is desaturated by 10%, the color
#D1342A is obtained.