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Accordion using simple html and css

In this tutorial we are going to create an accordion just using the simple HTML, JavaScript and CSS, as shown below Accordion example picture.

simple accordion example
Accordion example
Here is the complete code snippet which we could use to design the same accordion as shown above.

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<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<style>
.accordion {
  background-color: chartreuse;
  color: #444;
  cursor: pointer;
  padding: 18px;
  margin: 5px 0px 0 5px;
  width: 100%;
  border-top: 1px dotted #0069b9;
  text-align: left;
  
  outline: none;
  font-size: 15px;
  transition: 0.4s;
  transform: skew(-20deg);
}

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

.accordion:before {
  content: '\002B';
  color: #777;
  font-weight: bold;
  float: left;
  margin-right:10px;
  margin-left: 0px;
}

.active:before {
  content: "\2212";
}

.panel {
  padding: 0 18px;
  background-color: white;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
}
</style>
</head>
<body>

<h2>Accordion with symbols</h2>
<p>In this example we have added a "plus" sign to each button on the left side of the accordion section. When the user clicks on the button, the "plus" sign is replaced with a "minus" sign.</p>
<button class="accordion">Accordion 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>

<button class="accordion">Accordion 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>

<button class="accordion">Accordion 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>

<script>
var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
  acc[i].addEventListener("click", function() {
    this.classList.toggle("active");
    var panel = this.nextElementSibling;
    if (panel.style.maxHeight){
      panel.style.maxHeight = null;
    } else {
      panel.style.maxHeight = panel.scrollHeight + "px";
    } 
  });
}
</script>

</body>
</html>


You can browse this live example and try and play with this on W3School.com. Click here to open the example.
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