JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <input type="button" value="hello"/>
</div>

CSS

#container{
    height: 200px;
    width: 200px;
    border: 1px solid black;
    line-height: 200px;
    text-align: center;
}

button {
    vertical-align: middle;
}