tampermonkey gitlab collapse highlighter

s1.js

// ==UserScript==
// @name         New Userscript
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  try to take over the world!
// @author       You
// @match        http://gitlab.rdc.aquantia.com/*
// @grant        none
// ==/UserScript==

function GM_addStyle (cssStr) {
    var D               = document;
    var newNode         = D.createElement ('style');
    newNode.textContent = cssStr;

    var targ    = D.getElementsByTagName ('head')[0] || D.body || D.documentElement;
    targ.appendChild (newNode);
}

(function() {
    'use strict';

    GM_addStyle ( `
    .diff-collapsed {
        background: #FF2020 !important;
    }
` );

})();