JSFiddle - React, Tailwind, and code Playground

HTML

<p></p>
<button>button</button>

CSS

body{
 background:#444;  
}
button{
 background:#000;   
 color:#fff;
 border:none;
 transition:box-shadow .3s linear;
 -moz-transition:-moz-box-shadow .3s linear;
 -webkit-transition:-webkit-box-shadow .3s linear;
}
button:hover{
 box-shadow:0px 0px 15px #fff;
 -moz-box-shadow:0px 0px 15px #fff;
 -webkit-box-shadow:0px 0px 15px #fff;   
}