JSFiddle - React, Tailwind, and code Playground

HTML

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

CSS

.initials {
    position:relative;
    background: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;
}
.initials .text {
    position: relative;
}

@-webkit-keyframes test {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1
  }
}

.initials:before{
  content: "";
  background-image: url("http://static.tumblr.com/lxn1yld/Hnxnxaqya/space.gif");
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-animation-name: test;
  -webkit-animation-delay: 3s;
  -webkit-animation-duration: .3s;
  -webkit-animation-fill-mode: both;
}