The hex color #3759e2 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C8A61D. The grayscale version is
#7B7B7B. A 20% lighter version of the original color is
#6A8CFF, and Hex
#0426AF is the 20% darker color. If the color is saturated by 10%, you get
#3056EC. If the color is desaturated by 10%, the color
#3E5CD8 is obtained.