color.adjust() Lightness color.adjust($color, $lightness: $amount)
color.adjust(, $lightness: [-100 ～ 100]%)
Convertible
- lighten($color, [0 ～ 100]%) => color.adjust($color, $lightness: [0 ～ 100]%)
- darken($color, [0 ～ 100]%) => color.adjust($color, $lightness: [0 ～ -100]%)