JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-1.11.3.min.js"></script>

<div class="initials">A</div>

CSS

.initials {
    position:absolute;
    background:black;
        background-COLOR: black; 

    color:white;
    margin-top:20px;
    padding-top:20px;
    padding-bottom:20px;
    width:60px;
    text-align:center;
    margin-left:20px;
    font-size:17px;
    letter-spacing:5px;
    box-shadow:0px 2px 3px rgba(0,0,0,.15);
    overflow: hidden;
    white-space: nowrap;
}
 .with-image {
       background-color:none !important;
       background-image: url("http://static.tumblr.com/lxn1yld/Hnxnxaqya/space.gif");
  }

JavaScript

$( document ).ready(function() {
       var changeClass = function() {
             $(".initials").addClass("with-image");
       }
       setTimeout(changeClass, 3000);
});