The hex color #f23a2b is a dark color. The web-safe version is Hex
#FF3333. A complementary color is
#0DC5D4. The grayscale version is
#727272. A 20% lighter version of the original color is
#FF6D5E, and Hex
#BF0700 is the 20% darker color. If the color is saturated by 10%, you get
#FF3424. If the color is desaturated by 10%, the color
#E54032 is obtained.