   (whitespace-mode)
   (rainbow-delimiters-mode)
   (hl-line-mode)
+  (rainbow-mode)
   (centered-cursor-mode)
   ;; Language-aware editing commands. Useful for imenu-menu.
   (semantic-mode 1)

  (replace-regexp-in-string " " "-" (downcase title)))

(defun ar/string-digits-p (string)
  "Return t if STRING is an unsigned integer. nil otherwise."
  (if (string-match "\\`[[:digit:]]+\\'" string)
      t
    nil))

  (let ((m org-mode-map))
    (define-key m [f6] #'ar/export-blog-to-html))
  (set (make-local-variable 'show-trailing-whitespace) t)
  (set (make-local-variable 'whitespace-line-column) 1000)
  (ar/org-src-color-blocks-dark)
  (flyspell-mode-on)
  (whitespace-mode)
  (rainbow-delimiters-mode)
