Feature/material design reol 72

Which coding standards? Drupal coding standards?

The main issue is not using black/white. The main issue (in my head, at least) is being consistent. If we use black/white we should use all the defined colors where applicable, and if not, we should never use them.

I do not think we are going to reach an agreement here. I do not believe the trade-off of using white for readability is worth it, and i like the expressiveness of stating the exact color. I believe that $light and $dark definitions will work for all the cases covered here. When not applicable, i would just use #fff or #000.

Yes, you could use the same arguments for all the other syntaxes, but from them i have chosen the most compact, and most widely used one, namely #fff (or #ffffff where needed).

You are the main themer on this project, so you will eventually decide this.