PHP Form Required

<!DOCTYPE html>
<html>
<body style="font-family: sans-serif; padding: 20px;">
    <h2>Validasi Kolom Wajib Diisi</h2>
    <div style="background:#fee2e2; border-left:4px solid #ef4444; padding:12px; color:#991b1b; border-radius:4px;">
        &lt;?php if (empty($_POST['email'])) echo "Kolom Email wajib diisi!"; ?&gt;
    </div>
</body>
</html>