Does the same as this Add-on in extra.less with a flashing animation.
extra.less
/* Blinker NEW Animation on NEW Posts */
.node--unread .node-title:before {
content: "{{ phrase('𝓝𝓔𝓦') }}";
color: #FFF;
background: #b83b14;
display: inline-block;
font-size: 10px;
text-align: center...
Loading Improved
This add-on provides you with the capability to change your XenForo ajax loading indicator(s) to you liking. Deploy your own HTML, JavaScript and CSS code, including the ability to use XenForo Template Syntax and the LESS pre-processor.
Features include:
Create your own...