Constrains Wikipedia articles to 40em in width for easier reading.
// ==UserScript==
// @name Wikipedia Width Changer
// @namespace https://garner.io
// @version 1.2
// @description Constrains Wikipedia articles to 40em in width for easier reading.
// @author John Garner
// @icon https://www.wikipedia.org/static/favicon/wikipedia.ico
// @grant none
// @run-at document-start
// @include *://*.wikipedia.org/*
// @exclude *://*.wikipedia.org/w/*
// @exclude *://*.wikipedia.org/wiki/Main_Page*
// @exclude *://*.wikipedia.org/wiki/Talk*
// @exclude *://*.wikipedia.org/wiki/Special*
// @exclude *://*.wikipedia.org/wiki/Wikipedia*
// @exclude *://*.wikipedia.org/wiki/Help*
// @exclude *://*.wikipedia.org/wiki/Portal*
// ==/UserScript==
document.getElementById("content").style.maxWidth = '40em';
document.getElementById("content").style.margin = 'auto';