The hex color #2180cc is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#DE7F33. The grayscale version is
#7A7A7A. A 20% lighter version of the original color is
#54B3FF, and Hex
#004D99 is the 20% darker color. If the color is saturated by 10%, you get
#1881D4. If the color is desaturated by 10%, the color
#2A7FC4 is obtained.