The hex color #337dfd is a dark color. The web-safe version is Hex
#3366FF. A complementary color is
#CC8202. The grayscale version is
#8F8F8F. A 20% lighter version of the original color is
#66B0FF, and Hex
#004ACA is the 20% darker color. If the color is saturated by 10%, you get
#2A7BFF. If the color is desaturated by 10%, the color
#3C7FF2 is obtained.