RV-Shape--square()
	padding-top 100%
	width 100%
	position relative
	
	*
		position absolute
		top 0
		left 0
		bottom 0
		right 0
		
RV-Shape--circle()
	padding-top 100%
	width 100%
	position relative

	&, *
		border-radius 50%
	
	*
		position absolute
		top 0
		left 0
		bottom 0
		right 0

.RV-Shape
	
	&--square
		RV-Shape--square()
		
	&--circle
		RV-Shape--circle()