1. Color shortcuts and color conversions In CSS, you can write color values in a variety of ways, e.g. "RGB(0,0,0)", "black", and "#000000" all result in black. However, you can also use a shortcut for hexadecimal values that follows this form: "#000". #0BC for example means #00BBCC but is a little quicker to write. Sometimes when you need to feed color values into forms, e.g. for tools such as Go