Jetpack_Custom_CSS_Enhancements::preview_content_width PHP Method

    public static function preview_content_width()
    {
        global $wp_customize;
        if (!is_customize_preview()) {
            return;
        }
        $setting = $wp_customize->get_setting('jetpack_custom_css[content_width]');
        if (!$setting) {
            return;
        }
        $customized_content_width = (int) $setting->post_value();
        if (!empty($customized_content_width)) {
            $GLOBALS['content_width'] = $customized_content_width;
        }
    }