The hex color #0a66dd is a dark color. The web-safe version is Hex
#0066CC. A complementary color is
#F59922. The grayscale version is
#6F6F6F. A 20% lighter version of the original color is
#3D99FF, and Hex
#0033AA is the 20% darker color. If the color is saturated by 10%, you get
#0065E8. If the color is desaturated by 10%, the color
#1467D2 is obtained.