JSFiddle - React, Tailwind, and code Playground

HTML

<div id="content" class="collapsed">
    <p>1</p>
    <p>2</p>
    <p>3</p>
    <p>4</p>
    <p>5</p>
    <p>6</p>
    <p>7</p>
    <p>8</p>
    <p>9</p>
    <p>10</p>
</div>

CSS

div#content{ border: 1px solid black; cursor: pointer;}

div.collapsed{
     max-height: 40px;
    overflow:hidden;
}

JavaScript

var cont = document.getElementById("content");
cont.onclick = function() {
    var newClass = (cont.className==="collapsed") ? "" : "collapsed";
    cont.className = newClass;        
};