<!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
<style>
input.larger {
width: 50px;
height: 50px;
}
</style>
</head>
<body>
<h2>Checkbox size example</h2>
<p>Default checkbox size:</p>
<input type="checkbox" name="checkBox1" checked>
<p>A larger checkbox:</p>
<input type="checkbox" class="larger" name="checkBox2" checked>
</body>
</html>