The hex color #3a91e5 is a light color. The web-safe version is Hex
#3399CC. A complementary color is
#C56E1A. The grayscale version is
#909090. A 20% lighter version of the original color is
#6DC4FF, and Hex
#075EB2 is the 20% darker color. If the color is saturated by 10%, you get
#3191EE. If the color is desaturated by 10%, the color
#4391DD is obtained.