The hex color #1b9bc4 is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#E4643B. The grayscale version is
#7E7E7E. A 20% lighter version of the original color is
#4ECEF7, and Hex
#006891 is the 20% darker color. If the color is saturated by 10%, you get
#119ECB. If the color is desaturated by 10%, the color
#2598BD is obtained.