JSFiddle - React, Tailwind, and code Playground

by Stephen

HTML

<h2>Accordion</h2>

<div class="accordion open">
  <button class="one">Section 1</button>
  <div class="panel">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
  </div>
</div>

<div class="accordion">
  <button class="two">Section 2</button>
  <div class="panel">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
  </div>
</div>

<div class="accordion">
  <button class="three">Section 3</button>
  <div class="panel">
    <p>Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.</p>
  </div>
</div>

CSS

.accordion > button {
    background-color: #eee;
    color: #444;
    cursor: pointer;
    padding: 18px;
    width: 100%;
    border: none;
    text-align: left;
    outline: none;
    font-size: 15px;
    transition: 0.4s;
}

.active, .accordion > button:hover {
    background-color: #ccc; 
}

.accordion > .panel {
    padding: 0 18px;
    display: none;
    background-color: white;
    overflow: hidden;
    border: 2px solid #e0e0e0;
    border-top: none;
}
.accordion.open > .panel {
    display: block;
}

JavaScript

document.querySelectorAll('.accordion > button')
    .forEach(function(el) {
        console.log('class: ' + el.className);
        el.addEventListener('click', function(e) {
            this.parentElement.classList.toggle('open');
        });
    });