Allow CSS files

sunshine-custom-allowed-css.php

// Add this to your theme's functions.php file
// Or use this plugin https://wordpress.org/plugins/insert-headers-and-footers/
add_filter( 'sunshine_allowed_css', 'sunshine_custom_allowed_css' );
function sunshine_custom_allowed_css( $allowed ) {
    $allowed[] = 'cookie'; // This must contain a keyword from the wp_enqueue_style from your plugin/theme
    return $allowed;
}