The hex color #21a0fa is a light color. The web-safe version is Hex
#3399FF. A complementary color is
#DE5F05. The grayscale version is
#949494. A 20% lighter version of the original color is
#54D3FF, and Hex
#006DC7 is the 20% darker color. If the color is saturated by 10%, you get
#16A1FF. If the color is desaturated by 10%, the color
#2C9FF0 is obtained.