Learn how to create Accordion

<div class="accordionWrap">
  <button class="accordionHeading">Lorem Ipsum 1</button>
  <div class="accordionPanel">
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
  </div>
  <button class="accordionHeading">Lorem Ipsum 2</button>
  <div class="accordionPanel">
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
  </div>
  <button class="accordionHeading">Lorem Ipsum 3</button>
  <div class="accordionPanel">
    <p>Lorem Ipsum is simply dummy text of the printing and typesetting industry.</p>
  </div>
</div>

.accordionHeading {
  background-color: #008264;
  color: #ffffff;
  cursor: pointer;
  padding: 12px 30px;
  width: 100%;
  text-align: left;
  border: none;
  outline: none;
  margin-bottom: 8px;
  font-family: 'Poppins', sans-serif;
  font-weight: 600;
  font-size: 20px;
  line-height: 32px;
  border-radius: 10px;
  transition: background-color 0.3s ease-in-out;
}
.accordionHeading:hover, .accordionHeading.open {
  background-color:#036851;
}
.accordionHeading:after { 
  content: '\02795'; /* Unicode character for "plus" sign (+) */
  color: #fff;
  float: right;
  margin-left: 5px;
}
.accordionHeading.open:after {
  content: "\2796"; /* Unicode character for "minus" sign (-) */
}
.accordionPanel {
  padding:0 16px; 
  border-radius:5px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease-in-out;
}

var accordionHeading = document.getElementsByClassName("accordionHeading");
var i;
for (i = 0; i < accordionHeading.length; i++) {
  accordionHeading[i].addEventListener("click", function() {
    this.classList.toggle("open");
    var accordionPanel = this.nextElementSibling;
    if (accordionPanel.style.maxHeight) {
      accordionPanel.style.maxHeight = null;
    } else {
      accordionPanel.style.maxHeight = accordionPanel.scrollHeight + "px";
    }
  });
}