setting the width of the color picker button

@azirbel The calc width on the color picker button is forcing a bunch of overriding of styles to ensure that it works normally. I think the strategy here is have a standard, fixed width, and then, if people want, they can override it to get wider if needed, rather than the other way around.
@azirbel I think Grunt Removed this... I will add it back and re-commit.