JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
                      "http://www.w3.org/TR/xhtml1/DTD/xhtml-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ru" lang="ru">
<head>
<title>Table</title>
<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
<style type="text/css"> 
 html,body{

height:100%;
margin:0px;
padding:0px
}
table {
  background-color: #F2E0BE;
  width:100%;
  height:100%;
}
table td {
 text-align: center;
  vertical-align: middle;
}
span {
  vertical-align:50%;
  font-size:24px;
}
div {
 font-size: xx-large;
}
</style>
</head>

<body>
 <table>
   <tr>
    <td>
    <div>E = mc<span>2</span></div>
    </td>
   </tr>
 </table>
</body>
</html>