Width/height Sass mixin

wh.scss

@mixin wh($width: false, $height: false) {
	$width: unquote($width);
	@if $height != none { 
		$height: unquote($height); }
		
	@if $height != false {
		width: #{$width};
		height: #{$height}; }
	@else {
		width: #{$width};
		height: #{$width}; } }