JSFiddle - React, Tailwind, and code Playground

HTML

<div id="outside">
    <div id="inside">
        <div>more content 1</div>
        <div>more content 2</div>
        <div>more content 3</div>
        <div>more content 4</div>
        <div>more content 5</div>
        <div>more content 6</div>
        <div>more content 7</div>
        <div>more content 8</div>
        <div>more content 9</div>
        <div>more content 8</div>
        <div>more content 7</div>
        <div>more content 6</div>
        <div>more content 5</div>
        <div>more content 4</div>
        <div>more content 3</div>
        <div>more content 2</div>
        <div>more content 1</div>
    </div>
</div>

CSS

div#outside {
    width: 120px;
    height: 100px;
    overflow: hidden;
}

div#inside {
    width: 135px;
    height: 100px;
    overflow-y: auto;
}