The hex color #8f90d1 is a light color. The web-safe version is Hex
#9999CC. A complementary color is
#706F2E. The grayscale version is
#A5A5A5. A 20% lighter version of the original color is
#C2C3FF, and Hex
#5C5D9E is the 20% darker color. If the color is saturated by 10%, you get
#8D8ED5. If the color is desaturated by 10%, the color
#9192CD is obtained.