The hex color #3f55fa is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#C0AA05. The grayscale version is
#858585. A 20% lighter version of the original color is
#7288FF, and Hex
#0C22C7 is the 20% darker color. If the color is saturated by 10%, you get
#3850FF. If the color is desaturated by 10%, the color
#465AEE is obtained.