/* convert pixels to rem
example:
.class{
 font-size:rem(36);
}
*/

@function rem($pixels, $context: $baseFontSize) {
    @if (unitless($pixels)) {
        $pixels: $pixels * 1px;
    }
    @if (unitless($context)) {
        $context: $context * 1px;
    }
    @return $pixels / $context * 1rem;
}