JSFiddle - React, Tailwind, and code Playground

HTML

<div class="green">
</div>
<div class="red">
</div>
<div class="blue">
</div>

CSS

div{
    width: 33%;
    height: 20px;
    display: inline-block;
}

div.green{
    background-color: #00FF00;
}

div.red{
    background-color: #FF0000;
}

div.blue{
    background-color: #0000FF;
}