Custom style template

app.js

// ==UserScript==
// @name         Custom style template
// @description  template for adding custom style
// @version      0.1
// @author       Marco
// @homepage     https://marco.plus
// @namespace    https://marco.plus
// @website      https://twitter.com/Marco_utau
// @match        https://example.com
// @icon         https://www.google.com/s2/favicons?sz=64&domain=example.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';
    const style = `
    /* write css */
    `

    const styleElement = document.createElement("style");
    styleElement.textContent = style;
    document.body.appendChild(styleElement);
})();