anchor.diff:      "black"
       :type string
       :documentation "The color applied to elements appearing in front of
  -`background-color'.  Must contrast with `background-color'.")
  +`background-color'.  Must strongly contrast with `background-color'.")
      (primary-color
       "#555555"
       :type string
  -    :documentation "One of the colors applied to surfaces.  Should preferably be
  -neutral.")
  +    :documentation "One of the colors applied to surfaces.  Choose it such that
  +`on-primary-color' is white (black) on a light (dark) theme.  Preferably, it
  +should be neutral.")
      (on-primary-color
       "white"
       :type string
       :documentation "The color applied to elements appearing in front of
  -`primary-color'.  Must contrast with `primary'.")
  +`primary-color'.  Must strongly contrast with `primary'.")
      (secondary-color
       "#A6A6A6"
       :type string
  -    :documentation "One of the colors applied to surfaces.  Should preferably be
  -neutral.  Must be chosen such that `on-secondary-color' and `on-primary-color'
  -are not the same.")
  +    :documentation "One of the colors applied to surfaces.  Choose it such that
  +`on-secondary-color' is black (white) on a light (dark) theme.  Preferably, it
  +should be neutral.")
      (on-secondary-color
       "black"
       :type string
       :documentation "The color applied to elements appearing in front of
  -`secondary-color'.  Must contrast with `secondary'.")
  +`secondary-color'.  Must strongly contrast with `secondary'.")
      (accent-color
       "#37A8E4"
       :type string
  
positive.code:                  :dark-p t
                   :background-color "black"
                   :on-background-color "white"
                   :primary-color "#753C17"
                   :on-primary-color "white"
                   :secondary-color "#D88A52"
                   :on-secondary-color "black"
                   :accent-color "#C69203"
                   :on-accent-color "black"))
  
  (defvar theme nil
  
negative.code:     "black"
      :type string
      :documentation "The color applied to elements appearing in front of `accent'.
  Must strongly contrast with `accent'.")
     (font-family
      "Helvetica Neue, Helvetica"
      :type string
  