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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="../lib/w3.css">

<body class="w3-container">

<h2>Accordion Buttons</h2>
<p>You can use any HTML element to open the accordion content. We prefer a button with a w3-btn-block class, because it spans the entire width of its parent element, just like the accordion content (100% width). Remember that buttons in W3.CSS are centered by default. Use the w3-left-align class if you want them left aligned instead. However, you do not have to follow our approach.</p>

<div class="w3-accordion w3-light-grey">
  <button onclick="myFunction('Demo1')" class="w3-btn">
    Normal button
  </button>
  <div id="Demo1" class="w3-accordion-content w3-container">
    <p>Lorem ipsum...</p>
  </div>
  <button onclick="myFunction('Demo2')" class="w3-btn-block w3-left-align w3-green">
    Left aligned & full-width
  </button>
  <div id="Demo2" class="w3-accordion-content w3-container">
    <p>Lorem ipsum...</p>
  </div>
  <button onclick="myFunction('Demo3')" class="w3-btn-block w3-red">
    Centered & full-width
  </button>
  <div id="Demo3" class="w3-accordion-content w3-container w3-center">
    <p>Centered content as well!</p>
  </div>
</div>

<script>
function myFunction(id) {
    document.getElementById(id).classList.toggle("w3-show");
}
</script>

</body>

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</html>