JSFiddle - React, Tailwind, and code Playground

HTML

<div id="cf">
  <img class="bottom" src="http://i.imgur.com/qiupijw.png">
  <img class="top" src="http://i.imgur.com/IAUlHar.png">
</div>

CSS

#cf {
  position:relative;
  margin:0 auto;
}

#cf img {
  position:absolute;
  left:0;
  -webkit-transition: opacity 1s ease-in-out;
  -moz-transition: opacity 1s ease-in-out;
  -o-transition: opacity 1s ease-in-out;
  transition: opacity 1s ease-in-out;
}

#cf img.top {
    -webkit-transition: opacity 1s ease-in-out;
    -webkit-animation: fade 5s infinite;
}

@-webkit-keyframes fade {
    0% {opacity: 0;}
    50% {opacity: 1;}
    100% {opacity: 0;}
}