JSFiddle - React, Tailwind, and code Playground

HTML

<div id = "parent_div">
    <button>a</button>
    <button>b</button>
    <button>c</button>
    
</div>

CSS

#parent_div {
    width:200px;
    height:200px;
    border:solid 1px blue;
    display:flex;
    justify-content:center;
    align-items:center;
}