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Enable Vertical and Horizontal Scrollbar Everywhere

Enable vertical and horizontal page BODY scrolling (for example, where it is disabled if a modal is open).

// ==UserScript==
// @name Enable Vertical and Horizontal Scrollbar Everywhere
// @namespace RW5hYmxlIFZlcnRpY2FsIGFuZCBIb3Jpem9udGFsIFNjcm9sbGJhciBFdmVyeXdoZXJl
// @description Enable vertical and horizontal page BODY scrolling (for example, where it is disabled if a modal is open).
// @author smed79
// @version 1.2
// @encoding utf-8
// @license https://creativecommons.org/licenses/by-nc-sa/4.0/
// @icon https://i.ibb.co/9NBrg0r/icon.png
// @match http://*/*
// @match https://*/*
// @exclude http://*.youtube.com/watch?*
// @exclude https://*.youtube.com/watch?*
// @grant GM_addStyle
// ==/UserScript==

function addGlobalStyle(css) {
    var head, style;
    head = document.getElementsByTagName('head')[0];
    if (!head) {
        return;
    }
    style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

addGlobalStyle('html { overflow: auto !important; }');
addGlobalStyle('body { overflow: auto !important; }');