The hex color #0042d4 is a dark color. The web-safe version is Hex
#0033CC. A complementary color is
#FFBD2B. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#3375FF, and Hex
#000FA1 is the 20% darker color. If the color is saturated by 10%, you get
#003FE0. If the color is desaturated by 10%, the color
#0945C8 is obtained.