Converts pixel values to rem values with pixel fallbacks.

rem-converter.scss

$baseline_px: 16px;

@mixin rem($property, $px_values) {
    $baseline_rem: ($baseline_px / 1rem);
	#{$property}: $px_values;
	@if type-of($px_values) == 'number' {
		#{$property}: $px_values / $baseline_rem;
	} @else {
		$rem_values: ();
		@each $value in $px_values {
			@if $value == 0 { 
				$rem_values: append($rem_values, $value); 
			} @else {
				$rem_values: append($rem_values, ($value / $baseline_rem) );
			}
		}
		#{$property}: $rem_values;
	}
}