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<html><title>W3.CSS</title><meta name="viewport" content="width=device-width, initial-scale=1"><link rel="stylesheet" href="4/w3.css"><body><div 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-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><button onclick="myFunction('Demo1')" class="w3-button w3-light-grey">Normal button</button><div id="Demo1" class="w3-hide w3-container w3-light-grey"> <p>Lorem ipsum...</p></div><button onclick="myFunction('Demo2')" class="w3-button w3-block w3-left-align w3-green">Left aligned and full-width</button><div id="Demo2" class="w3-hide w3-container"> <p>Lorem ipsum...</p></div><button onclick="myFunction('Demo3')" class="w3-btn w3-block w3-red">Centered and full-width</button><div id="Demo3" class="w3-hide w3-container w3-center w3-pale-red"> <p>Centered content as well!</p></div></div><script>function myFunction(id) { var x = document.getElementById(id); if (x.className.indexOf("w3-show") == -1) { x.className += " w3-show"; } else { x.className = x.className.replace(" w3-show", ""); }}</script>