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@mixin aspect-ratio($ratio-or-width, $height: null) {
	$padding: if($height,
					percentage($height/$ratio-or-width),
					percentage(1/$ratio-or-width)
	);
	&:before { content:''; float: left; padding-bottom: $padding;  }
	&:after  { content:''; display: table; clear: both;  }
}