style-google-calendar.user.js

// ==UserScript==
// @name         StyleGoogleCalendar
// @namespace    https://pieinsurance.com/
// @version      0.1
// @description  make meeting responses more distinct
// @author       Gregory Seidman
// @match        https://calendar.google.com/calendar/*
// @icon         https://www.google.com/s2/favicons?domain=google.com
// @grant        GM_addStyle
// ==/UserScript==

(function() {
    'use strict';
    GM_addStyle(`
    .EfQccc.Epw9Dc {
      opacity: 0.6;
    }
    `);
})();