The hex color #128cfd is a dark color. The web-safe version is Hex
#0099FF. A complementary color is
#ED7302. The grayscale version is
#898989. A 20% lighter version of the original color is
#45BFFF, and Hex
#0059CA is the 20% darker color. If the color is saturated by 10%, you get
#068CFF. If the color is desaturated by 10%, the color
#1E8CF1 is obtained.