The hex color #3d73e7 is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#C28C18. The grayscale version is
#888888. A 20% lighter version of the original color is
#70A6FF, and Hex
#0A40B4 is the 20% darker color. If the color is saturated by 10%, you get
#3671F1. If the color is desaturated by 10%, the color
#4475DD is obtained.