<!DOCTYPE html>
<html>
<head>
<style>
#panel, .flip {
font-size: 16px;
padding: 10px;
text-align: center;
background-color: #4CAF50;
color: white;
border: solid 1px #a6d8a8;
margin: auto;
}
#panel {
display: none;
}
</style>
</head>
<body>
<p class="flip" onclick="myFunction()">Click to show panel</p>
<div id="panel">
<p>This panel contains a div element, which is hidden by default (display: none).</p>
<p>It is styled with CSS and we use JavaScript to show it (display: block).</p>
<p>How it works: Notice that the p element with class="flip" has an onclick attribute attached to it. When the user clicks on the p element, a function called myFunction() is executed, which changes the style of the div with id="panel" from display:none (hidden) to display:block (visible).</p>
<p>You will learn more about JavaScript in our JavaScript Tutorial.</p>
</div>
<script>
function myFunction() {
document.getElementById("panel").style.display = "block";
}
</script>
</body>
</html>