JSFiddle - React, Tailwind, and code Playground

HTML

<div id="sidebar">
    <div id="scroller">
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
        <p>Hello World</p>
   ...

CSS

html, body {
    min-height: 100%;
    height: 100%;
}
#sidebar{
    position: relative;
    width: 200px;
    border: 1px solid #000;
    min-height: 100%;
    overflow: hidden;
}
#scroller {
    position: absolute;
    top: 0;
    left: 0;
    bottom: 0;
    right: -20px;
    overflow-y: scroll;
}