miniMVC/assets/config/css_groups.php

<?php
return array(
	/*-----
			Css				
					-----*/
					
	'css' => array(
		'message.css'
	),
					
	/*
		For each group create an array like so
		
		'my_group' => array(
			'path/to/css/file1.css',
			'path/to/css/file2.css'
		),
	*/
);