Trello Card ID Userscript

Trello-Card-ID.js

// ==UserScript==
// @name         Trello Card ID
// @namespace    http://www.codesleuth.co.uk/
// @version      0.1
// @description  Adds card IDs to Trello cards
// @author       David Wood ([email protected])
// @match        https://trello.com/*/*/*
// @grant        none
// ==/UserScript==

function addGlobalStyle(css) {
    var head;
    head = document.getElementsByTagName('head')[0];
    if (!head) return;
    
    var style = document.createElement('style');
    style.type = 'text/css';
    style.innerHTML = css;
    head.appendChild(style);
}

addGlobalStyle('.card-short-id { display: inline !important; font-weight: bold; }');
addGlobalStyle('.card-short-id:after { content: " "; }');