The hex color #3e90c5 is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#C16F3A. The grayscale version is
#868686. A 20% lighter version of the original color is
#71C3F8, and Hex
#0B5D92 is the 20% darker color. If the color is saturated by 10%, you get
#3791CB. If the color is desaturated by 10%, the color
#458FBF is obtained.