centering images for UserScript

img-centering.user.js

// ==UserScript==
// @name        img centering
// @namespace   http://noromanba.flavors.me
// @description centering images for UserScript
// @include     http://book.geocities.jp/monene39/paperakyu*
// @grant       none
// @run-at      document-start
// @noframes
// @version     2015.9.6.2
// @homepage    https://gist.github.com/noromanba/6802d3a6be14061f1598
// @downloadURL https://gist.github.com/noromanba/6802d3a6be14061f1598/raw/img-centering.user.js
// @license     MIT License http://nrm.mit-license.org/2015
// @author      noromanba   http://noromanba.flavors.me
// @icon        https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Format-justify-center.svg/32px-Format-justify-center.svg.png
// @icon64      https://upload.wikimedia.org/wikipedia/commons/thumb/5/5e/Format-justify-center.svg/64px-Format-justify-center.svg.png
// ==/UserScript==

// Icon (PD by The people from the Tango! project)
// https://commons.wikimedia.org/wiki/File:Format-justify-center.svg

// Devel
// https://gist.github.com/noromanba/6802d3a6be14061f1598

// Bookmarklet
// http://let.hatelabo.jp/noromanba/let/hLHX8--x5Ok9


// e.g.
// http://book.geocities.jp/monene39/paperakyu00.html
(function () {
    document.body.style.textAlign = 'center';
    document.body.style.marginLeft = 'initial';
    document.body.style.marginRight = 'initial';
})();