src/Types/HSL.php
public function lighten($pct)
    {
        $lightness = $this->lightness() + $pct;
        $lightness = $lightness > 100 ? 100 : $lightness;

        return $this->withLightness($lightness);
    }
public function lighten($pct)
    {
        $lightness = $this->lightness() + $pct;
        $lightness = $lightness > 100 ? 100 : $lightness;

        return $this->withLightness($lightness);
    }
Lighten the color.

@param int $pct

@return static