JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container-fluid">
    <div class="row-fluid">
        <div class="centering text-center">
           
        </div>
    </div>
</div>

CSS

html, body{height:100%; margin:0;padding:0}
 
.container-fluid{
  height:100%;
  display:table;
  width: 100%;
  padding: 0;
}
 
.row-fluid {height: 100%; display:table-cell; vertical-align: middle;}
 
 

.centering {
  float:none;
  margin:0 auto;
    background: #abc;
    height: 25px; 
}