public function background($background = null)
    {
        // Return value
        if (is_null($background)) {
            return $this->background;
        }

        // Set value
        $this->background = $background;

        return $this;
    }
public function background($background = null)
    {
        // Return value
        if (is_null($background)) {
            return $this->background;
        }

        // Set value
        $this->background = $background;

        return $this;
    }
public function background ( $ background = null ) { // Return value if ( is_null ( $ background ) ) { return $ this -> background ; } // Set value $ this -> background = $ background ; return $ this ; }
Gets or defines the background property.

@param bool $background True to set background overlay, false otherwise.

@return mixed The background property, or $this.
Gets or defines the background property .