<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Fast Emoji Switch</title>
    <style>
        body { display: flex; justify-content: center; align-items: center; height: 100vh; margin: 0; background-color: #f0f0f0; font-family: Arial, sans-serif; font-size: 5rem; font-weight: bold; color: #333; }
        #emoji { transform: rotate(90deg); }
    </style>
</head>
<body>
    <div id="emoji"></div>
    <script>
        (function(){const e=document.getElementById("emoji");let t=!0;setInterval(()=>{e.textContent=t?":0":":)",t=!t},100)})();
    </script>
</body>
</html>
