JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/bootstrap/3.0.0-rc2/css/bootstrap-glyphicons.css">
<div id="mydiv">
	<a href="#" class="btn btn-warning btn-lg text-center" ">Ad</a>
	<a href="#" class="btn btn-warning btn-lg text-center">Oa</a>
	<a href="#" class="btn btn-warning btn-lg text-center">OO</a>
	<a href="#" class="btn btn-warning btn-lg text-center">Ii</a><br>
	<a href="#" class="btn btn-warning btn-lg text-center">Pp</a>
	<a href="#" class="btn btn-warning btn-lg text-center">Ge</a>
	<a href="#" class="btn btn-warning btn-lg text-center">Rt</a>
	<a href="#" class="btn btn-warning btn-lg>YU</a>
</div>

CSS

.btn{
    
    text-align:Center;
}