Adds a button to quickly hide and show everything in Miro

Minimal Miro.user.js

// ==UserScript==
// @name        Minimal Miro
// @namespace   Violentmonkey Scripts
// @match       https://miro.com/*
// @grant       GM_addStyle
// @version     1.0
// @author      -
// @description 11/4/2023, 7:51:59 AM
// ==/UserScript==

var styleElement;

function toggleCSS() {
    if (styleElement) {
        styleElement.remove();
        styleElement = null;
    } else {
        styleElement = GM_addStyle(`
            .desktop-ui__header, .desktop-ui__body {
                display: none !important;
            }
            .canvasContextMenu {
                display: none !important;
            }
        `);
    }
}

var button = document.createElement('button');
button.textContent = 'Toggle CSS';
button.style.position = 'fixed';
button.style.bottom = '10px';
button.style.left = '50%';
button.style.transform = 'translateX(-50%)';
button.addEventListener('click', toggleCSS);

document.body.appendChild(button);