Color of emacs margins

With the following in my .emacs I get narrow margins in text-mode buffers: (defun my-set-margins () "Set margins in current buffer." (setq left-margin-width 30) (setq right-margin-width 30)) (add-hook 'text-mode-hook 'my-set-margins) How can I change the color of the lines that appear to delimit these margins so that it's the same as my background color and not black like they are now? **EDIT** I know more now and this is my question: How do I add a hook to turn of the fringes in text-mode?