The hex color #0f99d4 is a dark color. The web-safe version is Hex
#0099CC. A complementary color is
#F0662B. The grayscale version is
#7F7F7F. A 20% lighter version of the original color is
#42CCFF, and Hex
#0066A1 is the 20% darker color. If the color is saturated by 10%, you get
#049CDD. If the color is desaturated by 10%, the color
#1A96CB is obtained.