The hex color #e90a4f is a dark color. The web-safe version is Hex
#FF0066. A complementary color is
#16F5B0. The grayscale version is
#6B6B6B. A 20% lighter version of the original color is
#FF3D82, and Hex
#B6001C is the 20% darker color. If the color is saturated by 10%, you get
#F6004C. If the color is desaturated by 10%, the color
#DC1452 is obtained.