JSFiddle - React, Tailwind, and code Playground

HTML

<a href="#" class="pulsing">This is a link</a>

CSS

.pulsing { 
   -webkit-animation: pulse 0.6s infinite; 
   -webkit-animation-direction: alternate; 
   -webkit-animation-timing-function: ease-out; 
}

@-webkit-keyframes pulse {
        0% {
                -webkit-box-shadow: 0 0 15px #ccc; 
                box-shadow: 0 0 15px #ccc;
        }
        100% {
                webkit-box-shadow: 0 0 5px #000; 
                box-shadow: 0 0 5px #000;
        }
}