JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/LeaVerou/prefixfree/gh-pages/prefixfree.min.js"></script>
<img src="http://aaa.b000.ru/images/2011/12/30/4chan-w1325234865243.jpg_th.jpg" />

CSS

@keyframes border-pulsate {
    0%   { border-color: rgba(0, 255, 255, 1); }
    50% { border-color: rgba(0, 255, 255, 0); }
    100%   { border-color: rgba(0, 255, 255, 1); }
}

img {
    display: block;
    margin: 20px auto;
    border: 20px solid cyan;
    animation: border-pulsate 2s infinite;
}