<!DOCTYPE html>
<html lang="en-US">
<head>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <style>
.point{
color: red;
font-size: 22px;
}
</style>
</head>
<body>
<h1>jQuery addClass() Method</h1>
<p>Click on the button to add the class 'point' to this paragraph.</p>
<button>Click Me</button>
<script>
$(document).ready(function(){
$("button").click(function(){
//. in front of className is not necessary.
$("p").addClass("point");
});
});
</script> </body>
</html>