function makecss()
{
    $makecss = file_put_contents(css_path(), "/********* Do not edit this file *********/\n/*\nMy Custom CSS - Maked by Salvatore Noschese\na.k.a. L'altroWeb - https://laltroweb.it/\n*/\n/********* Do not edit this file *********/\n\n" . mycustomcss());
    return $makecss;
}
function mccss_options()
{
    ?>
<div class="wrap">
<h2><?php 
    _e('Custom CSS Panel', 'mccss');
    ?>
</h2>
<form method="post" action="options.php">
<?php 
    settings_fields('mccss_settings');
    ?>
<p><?php 
    _e('Place your custom CSS code here:', 'mccss');
    ?>
 <input type="submit" class="button-secondary" value="<?php 
    _e('Save', 'mccss');
    ?>
" style="font-size: 20px; height: 35px; position: fixed; top: 35px; right: 15px; z-index: 5;" /></p>
<textarea name="my_custom_css" id="my_custom_css" dir="ltr" style="width:100%;height:350px;"><?php 
    echo get_option('my_custom_css');
    ?>
</textarea>
<script language="javascript">var editor = CodeMirror.fromTextArea(document.getElementById("my_custom_css"), { lineNumbers: true });</script>
<p>
<input type="submit" class="button-primary" value="<?php 
    _e('Save', 'mccss');
    ?>
" />
<input type="button" class="button-secondary" value="Top^" onclick="self.scrollTo(0, 0); return false;" style="float: right;" />
</p>
</form>
</div>
<?php 
    // Save also in *.css file!
    $mycustomcss = mycustomcss();
    if (!empty($mycustomcss)) {
        makecss();
    } elseif (empty($mycustomcss) && file_exists(css_path())) {
        unlink(css_path());
    }
}