JSFiddle - React, Tailwind, and code Playground

HTML

<div class="button-container">
    <button class="button">Click</button>
</div>

CSS

html,body{
    height: 100%;
    width:  100%;
}
.button-container{
    position: relative;
    left: 50%;
    top:  50%;
}
.button{
    padding: 0;
    height: 40px;
    width: 100px;
    margin-left: -53px; /*1/2 šířky + 3px border*/
    margin-top:  -43px; /*1/2 výšky + 3px border*/
}