[totaltec]

You need to loop through the CSS files in your module, and remove the one you want. Your module will probably need to be dependent on the Simple CMS module.

PHP Code:

/**
     * Get a list of CSS files required to display the widget properly
     *
     * @return array
     */
    public function getCSSFiles()
    {
        $list = parent::getCSSFiles();

        foreach ($list as $key => $css_file) {
            if ($css_file == 'this-one-css-file.css') {
               unset($list[$key]);
            }
        }

        return $list;
    } 


This code above is untested, just an example.