   "Cursor for dark theme."
   :type 'string
   :group 'readable-mono-theme-dark)
+
+(defcustom readable-mono-theme-dark-region "#012E38"
+  "Region for dark theme."
+  :type 'string
+  :group 'readable-mono-theme-light)
 
 (defcustom readable-mono-theme-dark-foreground "#8d9fa1"
   "Default foreground for dark theme."

  :type 'string
  :group 'readable-mono-theme-light)

(defcustom readable-mono-theme-light-foreground "#596e76"
  "Default foreground for light theme."
  :type 'string

   `(isearch-fail ((t (:inherit readable-mono-theme-critical))))
   `(lazy-highlight ((t (:inherit readable-mono-theme-subordinate :inverse-video t))))
   `(match ((t (:inherit highlight))))
   `(region
     ((((background light)) (:background ,readable-mono-theme-light-region))
      (((background dark)) (:background ,readable-mono-theme-dark-region))))

   ;; Visual aid
   `(cursor
