The hex color #3e55b4 is a dark color. The web-safe version is Hex
#3366CC. A complementary color is
#C1AA4B. The grayscale version is
#6D6D6D. A 20% lighter version of the original color is
#7188E7, and Hex
#0B2281 is the 20% darker color. If the color is saturated by 10%, you get
#3953BB. If the color is desaturated by 10%, the color
#4357AD is obtained.