The hex color #30e40d is a light color. The web-safe version is Hex
#33CC00. A complementary color is
#CF1BF2. The grayscale version is
#606060. A 20% lighter version of the original color is
#63FF40, and Hex
#00B100 is the 20% darker color. If the color is saturated by 10%, you get
#2BF105. If the color is desaturated by 10%, the color
#35D715 is obtained.