public function __construct()
{
$this->setStyle('error', new Style('white', 'red'));
$this->setStyle('info', new Style('green'));
$this->setStyle('comment', new Style('yellow'));
$this->setStyle('question', new Style('black', 'cyan'));
$this->setStyle('highlight', new Style('red'));
$this->setStyle('warning', new Style('black', 'yellow'));
$this->styleStack = new StyleStack();
}