JSFiddle - React, Tailwind, and code Playground

HTML

<p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf </p><p>alfkj aslkdjf slkdjf lksajf lkasjd flkajsd flkja sdlfkj asldkfj laskdj flkasjdf...

CSS

::-webkit-scrollbar {
    width: 15px;
}

::-webkit-scrollbar-track {
    background-color: rgba(100, 100, 100, .5);
    width: 15px;
}

::-webkit-scrollbar-thumb {
    background-color: #818B99;
    border-radius: 9px;
    width: 9px;
}