sass-site/source/assets/stylesheets/components/_sticky_footer.scss

// ===========================================================================
// STICKY FOOTER



$footer-height: 10.5em;

@include at-breakpoint(60em) {
  html,
  body { height: 100%; }

  .page {
    margin-bottom: -$footer-height;
    min-height: 100%;
        height: auto !important;
        height: 100%;
  }

  .footer-shim,
  .contentinfo {
    clear: both;
    height: $footer-height;
  }
}