The hex color #f55f4f is a light color. The web-safe version is Hex
#FF6666. A complementary color is
#0AA0B0. The grayscale version is
#8C8C8C. A 20% lighter version of the original color is
#FF9282, and Hex
#C22C1C is the 20% darker color. If the color is saturated by 10%, you get
#FF5B49. If the color is desaturated by 10%, the color
#EA6355 is obtained.