(add-to-list 'font-lock-extra-managed-props 'display)
(font-lock-add-keywords 'org-mode
                        `(("^.*?\\( \\)\\(:[[:alnum:]_@#%:]+:\\)$"
                           (1 `(face nil
                                     display (space :align-to (- right ,(org-string-width (match-string 2)) 3)))
                              prepend))) t)