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Kuroi_mato_O / Rentry scroll buttons

// ==UserScript==
// @name         Rentry scroll buttons
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Fixed scroll to top and bottom buttons & edit and export button to the top
// @author       Kuroi_Mato_O
// @license MIT
// @match        https://rentry.org/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=rentry.org
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    //create arrow buttons
    var s = 'position: fixed; z-index: 9999; border: none; background: #262626; transform: scale(1.5);' ;

    var upButton = document.createElement("button");
    upButton.innerHTML = "↑";
    upButton.style = `top: 130px; ${s}`;

    var downButton = document.createElement("button");
    downButton.innerHTML = "↓";
    downButton.style = `top: 180px; ${s}`;

    const parent = document.querySelector(".container");
    parent.appendChild(upButton);
    parent.appendChild(downButton);

    downButton.style.right = parent.offsetWidth + parent.offsetLeft + 5 + "px";
    upButton.style.right = parent.offsetWidth + parent.offsetLeft + 5 + "px";

    //edit and export buttons
    var miscButtons = document.getElementsByClassName("text-left")[0];
    var m = 'position: fixed; top:19px; transform:scale(1.3); display: flex; flex-direction: column-reverse; align-items: stretch;' ;
    if (miscButtons){
        miscButtons.style = `${m}`;
        miscButtons.style.right = parent.offsetWidth + parent.offsetLeft + 3 + "px";
    }
    //scroll function
    upButton.addEventListener("click", function() {
        var textTab = document.getElementsByClassName("CodeMirror-scroll")[0];
        var previewTab = document.getElementsByClassName("markdownx-preview")[0];
        if (textTab || previewTab) {
            textTab.scrollTop = 0;
            previewTab.scrollTop = 0;
        } else {
            window.scrollTo(0, 0);
        }
    });

    downButton.addEventListener("click", function() {
        var textTab = document.getElementsByClassName("CodeMirror-scroll")[0];
        var previewTab = document.getElementsByClassName("markdownx-preview")[0];
        if (textTab || previewTab) {
            textTab.scrollTop = textTab.scrollHeight;
            previewTab.scrollTop = previewTab.scrollHeight;
        } else {
            window.scrollTo(0, document.body.scrollHeight);
        }
    });})();