[Tampermonkey] Collapse GitLab Maintenance Banner

// ==UserScript==
// @name         Collapse GitLab Maintenance Banner
// @namespace    http://git.rwth-aachen.de/mpolitze
// @version      0.3
// @author       mpolitze
// @match        https://git.rwth-aachen.de/*
// @grant        none
// @updateUrl    https://git.rwth-aachen.de/-/snippets/954/raw/master/removeBanner.js?inline=false
// @downloadUrl  https://git.rwth-aachen.de/-/snippets/954/raw/master/removeBanner.js?inline=false
// ==/UserScript==

'use strict';
(function() {
    let css = `
    .broadcast-message{
        position: absolute;
        width: 23px;
        height: 23px;
        top: 52px;
        z-index: 1000;
        padding: 1px;
        overflow: hidden;
        border-radius: 50%;
        right: 15px;
        transition: width 0.15s, height 0.15s, border-radius 0.15s!important;
    }
    .broadcast-message:hover{
        width: 200px;
        height: 200px;
        border-radius: 2%;
    }`;
    function addGlobalStyle(css) {
        let head = document.getElementsByTagName('head')[0];
        if (!head) { return; }
        let style = document.createElement('style');
        style.type = 'text/css';
        style.innerHTML = css;
        head.appendChild(style);
    }

    addGlobalStyle(css);

    setTimeout(() => {
        console.log('xxx');
        let banners = document.getElementsByClassName('broadcast-message');
        let n=0;
        for(let b of banners){
            b.style.right = `${15+(n++)*25}px`;
            b.style.zIndex = 1000-n;
        }
    },1000);
})();