<?php
echo '<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Hello World</title>
<style>
@keyframes blink {
0% { opacity: 1; }
50% { opacity: 0; }
100% { opacity: 1; }
}
.blinking-text {
font-size: 24px;
font-weight: bold;
animation: blink 1s infinite;
color: red;
}
</style>
</head>
<body>
<p class="blinking-text">Hello, World!</p>
</body>
</html>';
?>