Loading Icon not showing up

Hey there,

Website: here

Code:

ul.job_listings.loading {
min-height: 96px;
border-bottom: 1px solid #dbdbdb;
border-left:1px solid #dbdbdb;
border-right: 1px solid #dbdbdb;
background: url(https://www.ajaxload.info/cache/FF/FF/FF/00/00/00/9-1.gif) no-repeat center 32px;
}

As you can see I have https://www.ajaxload.info/cache/FF/FF/FF/00/00/00/9-1.gif

As my loading icon but after like an hour the link breaks. Any Idea how to upload my own gif somewhere and use it?

Greets,

https://www.ads-software.com/plugins/wp-job-manager/