The hex color #3b64da is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C49B25. The grayscale version is
#7E7E7E. A 20% lighter version of the original color is
#6E97FF, and Hex
#0831A7 is the 20% darker color. If the color is saturated by 10%, you get
#3461E3. If the color is desaturated by 10%, the color
#4267D1 is obtained.