JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
<div class="child">
Center horizontal and vertical align 
</div>
</div>

CSS

.parent{
display:table;
    height:300px;
    text-align:center;
    border:solid 1px red;
    width:100%;
}
.child{
display:table-cell;
    vertical-align:middle;
    border:solid 1px green;
}