The hex color #3d83dd is a dark color. The web-safe version is Hex
#3399CC. A complementary color is
#C27C22. The grayscale version is
#8A8A8A. A 20% lighter version of the original color is
#70B6FF, and Hex
#0A50AA is the 20% darker color. If the color is saturated by 10%, you get
#3582E5. If the color is desaturated by 10%, the color
#4584D5 is obtained.