Color of emacs margins

Question

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?

Answer 1

This worked:

(set-face-attribute 'fringe nil :background "#2E2920" :foreground "#2E2920")

#2E2920 being my background color.