JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">
    <div class="child">
        Hello i(red color div) should be cenetered in vertical direction
    </div>
</div>

CSS

.child{    
width: 100%;
    height: 50%;
    margin-top: 25%;
    margin-bottom: 25%;
    background-color: red;
    color:white;
}
html,body,.container{
    width:100%;
    height:100%;
    background:url('http://cdn.morguefile.com/imageData/public/files/e/earl53/preview/fldr_2009_05_25/file5821243281047.jpg');
    background-size:cover;
    
}