The hex color #f55a90 is a light color. The web-safe version is Hex
#FF6699. A complementary color is
#0AA56F. The grayscale version is
#A0A0A0. A 20% lighter version of the original color is
#FF8DC3, and Hex
#C2275D is the 20% darker color. If the color is saturated by 10%, you get
#FE538E. If the color is desaturated by 10%, the color
#EC6192 is obtained.