The hex color #3e90a9 is a dark color. The web-safe version is Hex
#339999. A complementary color is
#C16F56. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#71C3DC, and Hex
#0B5D76 is the 20% darker color. If the color is saturated by 10%, you get
#3892AD. If the color is desaturated by 10%, the color
#448EA5 is obtained.