Using opposite-position

This mixin creates a triangle using the border properties in css. By using the opposite-position function in Compass we can create a triangle with only 1 argument and let the mixin calculate the opposite side.

	$opposite: opposite-position($point)
	border: 100px solid transparent
	border-#{$opposite}: 100px solid #000
	border-#{$point}: 0
	height: 0
	width: 0

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