The hex color #1b83bc is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#E47C43. The grayscale version is
#737373. A 20% lighter version of the original color is
#4EB6EF, and Hex
#005089 is the 20% darker color. If the color is saturated by 10%, you get
#1285C3. If the color is desaturated by 10%, the color
#2481B5 is obtained.