JSFiddle - React, Tailwind, and code Playground

HTML

<div class="row">
    <div class="box">1</div>
    <div  class="box">2</div>
</div>
<div class="row">
    <div  class="box">3</div>
    <div  class="box">4</div>
</div>

CSS

.row {
    margin: 0 auto;
    text-align:center;
}
.box {
    display:inline-block;
    background:red;
    width:100px; 
    height:50px;
    margin:5px;
}