The hex color #3a90df is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#C56F20. The grayscale version is
#8E8E8E. A 20% lighter version of the original color is
#6DC3FF, and Hex
#075DAC is the 20% darker color. If the color is saturated by 10%, you get
#3290E7. If the color is desaturated by 10%, the color
#4290D7 is obtained.