JSFiddle - React, Tailwind, and code Playground

HTML

<div class="blink" style="background: red">
    Foobar
</div>

CSS

@keyframes blink {
    0% { box-shadow: 0 0 15px green; }
    50% { box-shadow: none; }
    100% { box-shadow: 0 0 15px green; }
}

@-webkit-keyframes blink {
    0% { box-shadow: 0 0 15px green; }
    50% { box-shadow: 0 0 0; }
    100% { box-shadow: 0 0 15px green; }
}

.blink {
    -webkit-animation: blink 1.0s linear infinite;
    -moz-animation: blink 1.0s linear infinite;
    -ms-animation: blink 1.0s linear infinite;
    -o-animation: blink 1.0s linear infinite;
    animation: blink 1.0s linear infinite;
}