Inoreader - Space のスクロール量を調整する

// ==UserScript==
// @name         inoreader
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://www.inoreader.com/*
// @match        https://jp.inoreader.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=inoreader.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const ele = document.getElementById("reader_pane");
    ele.addEventListener("keydown", (e) => {
        if (e.code == "Space") {
            let value = 100;
            if (e.shiftKey) {
                value = -1 * value;
            }
            ele.scrollTop += value;
            e.stopPropagation();
            e.preventDefault();
        }
    })
})();