The hex color #ff5f55 is a light color. The web-safe version is Hex
#FF6666. A complementary color is
#00A0AA. The grayscale version is
#919191. A 20% lighter version of the original color is
#FF9288, and Hex
#CC2C22 is the 20% darker color. If the color is saturated by 10%, you get
#FF5A4F. If the color is desaturated by 10%, the color
#F4645B is obtained.