public function darken($pct)
    {
        $lightness = $this->lightness() - $pct;
        $lightness = $lightness < 0 ? 0 : $lightness;

        return $this->withLightness($lightness);
    }
public function darken($pct)
    {
        $lightness = $this->lightness() - $pct;
        $lightness = $lightness < 0 ? 0 : $lightness;

        return $this->withLightness($lightness);
    }
public function darken ( $ pct ) { $ lightness = $ this -> lightness ( ) - $ pct ; $ lightness = $ lightness < 0 ? 0 : $ lightness ; return $ this -> withLightness ( $ lightness ) ; }
Darken the color.

@param int $pct

@return static
Darken the color .