<!DOCTYPE html>
<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>Animated Accordions</h2>
<p>Use any of the w3-animate-classes to fade, zoom or slide in the accordion content (w3-animate-zoom|opacity|top|bottom|left|right):</p>
<button onclick="myFunction('Demo1')" class="w3-button w3-block w3-black w3-left-align">Accordion</button>
<div id="Demo1" class="w3-hide w3-animate-zoom">
<a href="#" class="w3-button w3-block w3-left-align">Link 1</a>
<a href="#" class="w3-button w3-block w3-left-align">Link 2</a>
<a href="#" class="w3-button w3-block w3-left-align">Link 3</a>
</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>
</body>
</html>