The hex color #3d59b5 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C2A64A. The grayscale version is
#6E6E6E. A 20% lighter version of the original color is
#708CE8, and Hex
#0A2682 is the 20% darker color. If the color is saturated by 10%, you get
#3857BC. If the color is desaturated by 10%, the color
#425BAE is obtained.