The hex color #3d90a8 is a dark color. The web-safe version is Hex
#339999. A complementary color is
#C26F57. The grayscale version is
#7C7C7C. A 20% lighter version of the original color is
#70C3DB, and Hex
#0A5D75 is the 20% darker color. If the color is saturated by 10%, you get
#3792AC. If the color is desaturated by 10%, the color
#438EA4 is obtained.