The hex color #0f3f61 is a dark color. The web-safe version is Hex
#003366. A complementary color is
#F0C09E. The grayscale version is
#3A3A3A. A 20% lighter version of the original color is
#427294, and Hex
#000C2E is the 20% darker color. If the color is saturated by 10%, you get
#0B3F65. If the color is desaturated by 10%, the color
#133F5D is obtained.