The hex color #3f50dd is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C0AF22. The grayscale version is
#797979. A 20% lighter version of the original color is
#7283FF, and Hex
#0C1DAA is the 20% darker color. If the color is saturated by 10%, you get
#394CE7. If the color is desaturated by 10%, the color
#4554D3 is obtained.