src/Flash.php
public function overlay($title, $message, $level = 'info', $key = 'flash_message')
    {
        return $this->create($title, $message, $level, $key.'_overlay');
    }
public function overlay($title, $message, $level = 'info', $key = 'flash_message')
    {
        return $this->create($title, $message, $level, $key.'_overlay');
    }
Flash an overlay modal.

@param string $title
@param string $message
@param string $level
@param string $key

@return $this