<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.0/jquery.min.js"></script>
<style>
.green {
color: green;
}
.blue {
color: blue;
}
</style>
</head>
<body>
<p class="green">First paragraph.</p>
<p class="blue">Second paragraph.</p>
<button id="buttonId">Remove classes</button>
<script>
$(document).ready(function() {
$("#buttonId").click(function() {
$("p").removeClass();
});
});
</script>
</body>
</html>