The hex color #3d11a8 is a dark color. The web-safe version is Hex
#330099. A complementary color is
#C2EE57. The grayscale version is
#525252. A 20% lighter version of the original color is
#7044DB, and Hex
#0A0075 is the 20% darker color. If the color is saturated by 10%, you get
#3B0BB1. If the color is desaturated by 10%, the color
#3F189F is obtained.