JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container">
    <div id="left">left</div>
    <div id="right">right</div>
</div>

CSS

#container {
    width: 400px;
    background-color: #eee;
}

#left {
    width: 250px;
    border: 1px solid #ccc;
    display: inline;
    float: left;
    margin-right:-104px;
}

#right {
    width: 250px;
    border: 1px solid #ccc;
    display: inline;
    float: right;
}