How can CSS be effectively utilized to style HTML elements generated by PHP scripts for email messages?

When styling HTML elements generated by PHP scripts for email messages, inline CSS can be used effectively. This means including CSS styles directly within the HTML tags or using the style attribute. This ensures that the styles are applied correctly when the email is received by the recipient.

<?php
// PHP script to generate HTML email message with inline CSS styles

$subject = "Your Subject Here";
$message = "
<html>
<head>
<title>Your Email Title</title>
</head>
<body>
<div style='background-color: #f2f2f2; padding: 20px;'>
<h1 style='color: #333;'>Hello, World!</h1>
<p style='color: #666;'>This is a sample email message with inline CSS styling.</p>
</div>
</body>
</html>
";

// Additional headers
$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type:text/html;charset=UTF-8" . "\r\n";

// Send email
mail('recipient@example.com', $subject, $message, $headers);
?>