Help making php display larger

I've got a php script to enable users to upload files to a server.  It
works, but when testing it on my android phone, I saw the text is really
small.   How can I make it appear larger on an android device?  Here's
the script.

thanks


<?php
    if (isset($_FILES['upload'])) {
        $uploadDir = '/var/www/uploads/'; //path you wish to store you
uploaded files
        $uploadedFile = $uploadDir . basename($_FILES['upload']['name']);
        if(move_uploaded_file($_FILES['upload']['tmp_name'],
$uploadedFile)) {
            echo 'File was uploaded successfully.';
        } else {
            echo 'There was a problem saving the uploaded file';
        }
        echo '<br/><a href="FileUpload.php">Back to Uploader</a>';
    } else {
    ?>

        <form action="upload.php" method="post"
enctype="multipart/form-data">
            <label for="upload">File:</label>
            <input type="file" name="upload" id="upload"><br/>
            <input type="submit" name="submit" value="Upload">
            </form>
        <?php
    }
?>

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