The hex color #2f99d3 is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#D0662C. The grayscale version is
#898989. A 20% lighter version of the original color is
#62CCFF, and Hex
#0066A0 is the 20% darker color. If the color is saturated by 10%, you get
#269BDA. If the color is desaturated by 10%, the color
#3897CC is obtained.