_layouts/default.html

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en-us">
<script src="https://unpkg.com/simple-jekyll-search@1.5.0/dest/simple-jekyll-search.min.js"></script>
<!-- mathjax config similar to math.stackexchange -->
<script type="text/x-mathjax-config">
MathJax.Hub.Config({
  jax: ["input/TeX", "output/HTML-CSS"],
  tex2jax: {
    inlineMath: [ ['$', '$'] ],
    displayMath: [ ['$$', '$$']],
    processEscapes: true,
    skipTags: ['script', 'noscript', 'style', 'textarea', 'pre', 'code']
  },
  messageStyle: "none",
  "HTML-CSS": { preferredFont: "TeX", availableFonts: ["STIX","TeX"] }
});
</script>
<script src="http://cdn.mathjax.org/mathjax/latest/MathJax.js?config=TeX-AMS_HTML" type="text/javascript"></script>

  {% include head.html %}

  <body class="theme-base-0d">

    {% include sidebar.html %}

    <div class="content container">
      {{ content }}
    </div>

{% include slider_scripts.html %}
  </body>
</html>