The hex color #000298 is a dark color. The web-safe version is Hex
#000099. A complementary color is
#FFFD67. The grayscale version is
#333333. A 20% lighter version of the original color is
#3335CB, and Hex
#000065 is the 20% darker color. If the color is saturated by 10%, you get
#0000A2. If the color is desaturated by 10%, the color
#05078E is obtained.