https://www.famcap.com/content/mu-plugins/global-notices/assets/js/notices-scripts.js

1function sfSetCookie(name,value,days) {
2    var expires = ""
3    if (days) {
4        var date = new Date()
5        date.setTime(date.getTime() + (days*24*60*60*1000))
6        expires = "; expires=" + date.toUTCString()
7    }
8    document.cookie = name + "=" + (value || "")  + expires + "; path=/"
9}
10
11jQuery(document).ready(function () {
12    jQuery('.sf-notice__close').on('click', function (e) {
13        e.preventDefault()
14        var notice = jQuery(this).closest('.sf-notice')
15        // eventually set the cookie
16        if (notice.hasClass('sf-notice--dismissable')) {
17            var cookie = 'dismissed_notice_' + notice.attr('id')
18            sfSetCookie(cookie, 1, 365)
19        }
20        // close the notice
21        notice.slideUp('fast')
22    });
23});