clearfix()
boxShadow([5,10], 5, 'green')
roundedCorners(20)
roundedCorners('left', 10)
roundedCorners('bl', 30)
verticalCentering(50)
horizontalCentering(50)
darken(10..100)
lighten(10..100)
saturate(10..100)
saturate(-10..-100)