Hide Try New Tweetdeck Preview

hide-preview.user.js

// ==UserScript==
// @name         Hide Try New Tweetdeck Preview
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        https://tweetdeck.twitter.com/
// @icon         https://www.google.com/s2/favicons?sz=64&domain=twitter.com
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    // Your code here...

    function createElement(_type,code) {
        let s = document.createElement(_type);
        s.appendChild(document.createTextNode(code));
        document.body.appendChild(s);
    }
    createElement('style','div.js-gryphon-beta-btn.gryphon-beta-btn-container{display: none}') // <style> code </style>
})();