Color in Atom
If you are using Atom as your text editor, there are two packages you may want to consider installing:
color-picker - The atom color picker lets you inspect colors, as any value type (rgb, hex, hsl, etc.), and navigate a color "picker" so that you can insert any color value. Once, installed, you can pull up this package with the "atom command palette" by typing color.
pigments - The atom pigments package highlights color values in your code. This can make it easier to visually see in atom, while developing the colors that will appear.