Reverted the HalfLineHeight value.

index.styl

@@ -244,15 +244,11 @@ hyphens(value)
 // Helpers (using line height as your unit of scale for vertical/horizontal rhythm.)
 //
 
-dividePixels(a,b)
-	r = (a / b)
-	return unit(r, 'px')
-
 // This is the default root line height
 baseLineHeight = 24
 
 QuarterLineHeight = baseLineHeight/4 px
-HalfLineHeight = dividePixels(baseLineHeight, 2)
+HalfLineHeight = baseLineHeight/2 px
 ThreeQuartersLineHeight = baseLineHeight*3/4 px
 OneLineHeight = baseLineHeight px
 OneAndAHalfLineHeights = baseLineHeight*1.5 px