The hex color #3a3d9f is a dark color. The web-safe version is Hex
#333399. A complementary color is
#C5C260. The grayscale version is
#5D5D5D. A 20% lighter version of the original color is
#6D70D2, and Hex
#070A6C is the 20% darker color. If the color is saturated by 10%, you get
#373AA6. If the color is desaturated by 10%, the color
#3D4098 is obtained.