A simple mixin for positioning elements.

posititioning.sass

// ============================================================
//          Positioning Mixins                                  
// ------------------------------------------------------------

//**
// Private Mixin: _set-position 
// Set the Position for the Position Mixins
//
// @mixin   	_set-position
// @param 		$position {list} One Value = top, Two Value = top left, Four Values = top right bottom left (t = zero position) can be in px or %
// @usage: 		+_set-position($position)
// 					...
//**
@mixin _set-position($position)
	
	$targets: null !default
	$count: null !default

	$count: length($position)

	@if $count == 1
		$targets: top
	@if $count == 2
		$targets: top left
	@if $count == 4
		$targets: top right bottom left
		
	@for $i from 1 through $count
		@if nth($position,$i) == t
			#{nth($targets,($i))}: 0
		@else
			@if nth($position,$i) > 0 or nth($position,$i) < 0
				@if unitless(nth($position,$i))
					#{nth($targets,($i))}: nth($position,$i) + 0px
				@else
					#{nth($targets,($i))}: nth($position,$i)

//**
// Mixin: relative 
// Relative Positioning Elements
//
// @mixin 		relative
// @param 		$pos {list} One Value = top, Two Value = top left, Four Values = top right bottom left (t = zero position) can be in px or %
// @usage: 		+relative(1)
// 					...
//**
@mixin relative($pos: 0)
	position: relative
	+_set-position($pos)

//**
// Mixin: absolute 
// Absolute Positioning Elements
//
// @mixin 		absolute
// @param 		$pos {list} One Value = top, Two Value = top left, Four Values = top right bottom left (t = zero position) can be in px or %
// @usage: 		+absolute(10 10%)
// 					...
//**
@mixin absolute($pos: 0 0 0 0)
	position: absolute
	+_set-position($pos)

//**
// Mixin: fixed 
// Fixed Positioning Elements
//
// @mixin 		fixed
// @param 		$pos {list} One Value = top, Two Value = top left, Four Values = top right bottom left (t = zero position) can be in px or %
// @usage: 		+fixed(10)
// 					...
//**
@mixin fixed($pos: 0 0 0 0)
	position: fixed
	+_set-position($pos)	

//**
// Mixin: static 
// Reset CSS Position Methods
//
// @mixin 		static
// @usage: 		+static
// 					...
//**
@mixin static
	position: static
	left: inherit
	right: inherit
	top: inherit
	bottom: inherit