Userscript to change column width of the Mastodon UI

userscript.js

// ==UserScript==
// @name         Column width
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  https://github.com/tootsuite/mastodon/issues/8632
// @author       dampatnight
// @match        https://neurodifferent.me*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';

    function getWidth() {
        return Math.max(
            document.body.scrollWidth,
            document.documentElement.scrollWidth,
            document.body.offsetWidth,
            document.documentElement.offsetWidth,
            document.documentElement.clientWidth
        );
    }

    GM_addStyle ( `
@media screen and (min-width: 631px) {
  :not(#mastodon-timeline) > .column {
    flex: 1 0 25%;
  }
}
@media screen and (min-width: 631px) {
  :not(#mastodon-timeline) > .media-gallery {
    height: ${0.33 * getWidth()}px;
  }
}
    ` );

})();