The hex color #3f70f7 is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#C08F08. The grayscale version is
#8D8D8D. A 20% lighter version of the original color is
#72A3FF, and Hex
#0C3DC4 is the 20% darker color. If the color is saturated by 10%, you get
#376DFF. If the color is desaturated by 10%, the color
#4773EC is obtained.