JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div id ="box">
      <a> is am athe centre?'</a>
    </div>
</body>

CSS

body
{
    width: 100%;
    margin: 0 auto;
}
#box {
      position:absolute;
      background:red; 
      width:450px; 
      height:200px;
      margin-left: 10%;
      margin-top: 20%;
      }