JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    <div class="content">
        Foobar
    </div>
</div>

CSS

.wrapper {
    width: 400px;
    padding: 15px;
    overflow-y: auto;
    border: 1px solid black;
}

.content {
    width: 800px;
    background: red;
}