JSFiddle - React, Tailwind, and code Playground

HTML

<body>
<div class="form__element" ></div>.
</body>

CSS

body{
   background: #000000;

 }
 
 @-webkit-keyframes input-shadow {
    0% {
        box-shadow: none;
    }
    50% {
        box-shadow: 0px 0px 26px #FFFFFF;
    }
    100% {
        box-shadow: none;
    }
  }

@keyframes input-shadow {
    0% {
        box-shadow: none;
    }
    50% {
        box-shadow: 0px 0px 26px #FFFFFF;
    }
    100% {
        box-shadow: none;
    }
 }
.form__element {
  border-radius:100%;
  width:100px;
  height:100px;
  background: white;
-webkit-animation:input-shadow ease-in-out 2s infinite; /* Chrome, Safari, Opera */
animation:input-shadow ease-in-out 2s infinite;

}