SCSS Compass Font Size - Vertical Rhythm

output.css

html {
  font: 100%/1.5em "Helvetica Neue", Helvetica, Arial, sans-serif; }

body {
  background-image: -webkit-gradient(linear, 50% 100%, 50% 0%, color-stop(5%, #e1e1e1), color-stop(5%, rgba(225, 225, 225, 0)));
  background-image: -webkit-linear-gradient(bottom, #e1e1e1 5%, rgba(225, 225, 225, 0) 5%);
  background-image: -moz-linear-gradient(bottom, #e1e1e1 5%, rgba(225, 225, 225, 0) 5%);
  background-image: -o-linear-gradient(bottom, #e1e1e1 5%, rgba(225, 225, 225, 0) 5%);
  background-image: linear-gradient(bottom, #e1e1e1 5%, rgba(225, 225, 225, 0) 5%);
  -webkit-background-size: 100% 24px;
  -moz-background-size: 100% 24px;
  -o-background-size: 100% 24px;
  background-size: 100% 24px;
  background-position: left top;
  margin: 0; }

h1, .h1 {
  font-size: 3em;
  line-height: 1.5em;
  margin-top: 0em;
  margin-bottom: 0.5em; }

h2, .h2 {
  font-size: 2.25em;
  line-height: 1.33333em;
  margin-top: 0em;
  margin-bottom: 0.66667em; }

h3, .h3 {
  font-size: 1.5em;
  line-height: 2em;
  margin-top: 0em;
  margin-bottom: 1em; }

h4, .h4 {
  font-size: 1.3125em;
  line-height: 2.28571em;
  margin-top: 0em;
  margin-bottom: 1.14286em; }

h5, .h5 {
  font-size: 1.125em;
  line-height: 1.33333em;
  margin-top: 0em;
  margin-bottom: 1.33333em; }

h6, .h6 {
  font-size: 1em;
  line-height: 1.5em;
  margin-top: 0em;
  margin-bottom: 1.5em; }

output.scss

@import "compass/typography/vertical_rhythm";

$base-font-size: 16px;
$base-line-height: 24px;
$browser-default-font-size: 16px;
$title-font-size: (h1 48px) (h2 36px) (h3 24px) (h4 21px) (h5 18px) (h6 16px);
$font-sans: "Helvetica Neue", Helvetica, Arial, sans-serif;

$font-body: $font-sans;

@mixin establish-baseline($font-size: $base-font-size, $font-family: $font-body) {
  $taille: ($font-size / $browser-default-font-size * 100);
  $line-height: rhythm(1, $font-size);
  html {
    font: #{$taille}%/#{$line-height} $font-family;
  }
}

body {
  @include baseline-grid-background($base-line-height, $color:#e1e1e1);
  margin: 0;
}

@include establish-baseline; // html
@each $typo-array in $title-font-size {
  $balise: nth($typo-array, 1);
  $taille: nth($typo-array, 2);
  #{$balise}, .#{$balise} {
    @include adjust-font-size-to($taille);
    @include margin-leader(0,$taille );
    @include margin-trailer(1,$taille );
  }
}