JSFiddle - React, Tailwind, and code Playground

HTML

<div id="container1"><div id="container2">
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    hello<br/>I<br/>am<br/>here<br/>
    good<br/>bye.
</div><div>

CSS

#container1{
    height: 100% !important;
    width: 100% !important;
    border: 1px solid green;
    overflow: hidden !important;
}

#container2{
    width: 100% !important;
    height: 99% !important;
    border: 1px solid blue;
    overflow: auto !important;
    padding-right: 15px !important;
}

html, body{
    height: 99% !important;
    border: 1px solid red;
    overflow:hidden !important;
}