Pragmatic Guide to Sass 3

$primary_color: #369;
$secondary_color: #eee;
$page_width: 300px;

body {
  // Set the background to be #369
  background: $primary_color;
  #wrapper {
    width: $page_width;
    background: white;
    border: $secondary_color;
    h1 {
      color: $primary_color; } } }