JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrap">
    <div id="one">1</div>
    <div id="two">2</div>
</div>

CSS

#wrap
{
    max-width: 400px;
    margin: auto;
    border: 2px solid black;
}

#one, #two
{
    width: 50%;
    background: green;
    float: left;
}

#two
{
    background: red;
}