The hex color #1a66f7 is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#E59908. The grayscale version is
#7D7D7D. A 20% lighter version of the original color is
#4D99FF, and Hex
#0033C4 is the 20% darker color. If the color is saturated by 10%, you get
#1064FF. If the color is desaturated by 10%, the color
#2468EB is obtained.