JSFiddle - React, Tailwind, and code Playground

HTML

<div id="big">
    <div id="small">
        
    </div>
</div>

CSS

#big {
    width:200px;
    height:300px;
    background-color: blue;
    line-height:300px;
    text-align:center;
}
#small {
    width:20px;
    height:30px;
    background-color:red;
    vertical-align: middle;
    display:inline-block;
}