_sass/bourbon/functions/_px-to-rem.scss


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// Convert pixels to rems
// eg. for a relational value of 12px write rem(12)
// Assumes $em-base is the font-size of <html>

@function rem($pxval) {
  @if not unitless($pxval) {
    $pxval: strip-units($pxval);
  }

  $base: $em-base;
  @if not unitless($base) {
    $base: strip-units($base);
  }
  @return ($pxval / $base) * 1rem;
}