Adds a big smiley face to the upper right corner of every page

Big Smileys Everywhere.user.js

// ==UserScript==
// @name         Big Smileys Everywhere
// @description  Adds a big smiley face to the upper right corner of every page
// @version      1
// @match        *://*/*
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';
    const smileyImg = "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAYAAABXAvmHAAAAeElEQVRoQ+2XsQmAMBCEWQ/U8QvDQikfUCZwEhYf+B8sxvAghPYX3dKBL0GQc0Zbknv1vvJtFn/xEoYRnRHm7xkAAAAASUVORK5CYII=";

    const smileyDiv = document.createElement('div');
    smileyDiv.style.position = 'fixed';
    smileyDiv.style.top = '20px';
    smileyDiv.style.right = '20px';
    smileyDiv.style.zIndex = '9999';
    smileyDiv.innerHTML = `<img src="${smileyImg}" alt="Big smiley">`;
    document.body.appendChild(smileyDiv);

    GM_addStyle(`
        #big-smiley:hover {
            transform: scale(1.2);
            transition: transform 0.2s ease-in-out;
            cursor: pointer;
        }
    `);
})();