jerryscript/_includes/header.html

<header class="site-header">

  <div style="background-color: #2388DB;">
      <div class="wrapper">

        <a class="site-title" href="{{ site.baseurl }}/">{{ site.title }}</a>

        <nav class="site-nav">
          <a href="#" class="menu-icon" id="menu-icon">
            <svg viewBox="0 0 18 15">
              <path fill="#424242" d="M18,1.484c0,0.82-0.665,1.484-1.484,1.484H1.484C0.665,2.969,0,2.304,0,1.484l0,0C0,0.665,0.665,0,1.484,0 h15.031C17.335,0,18,0.665,18,1.484L18,1.484z"/>
              <path fill="#424242" d="M18,7.516C18,8.335,17.335,9,16.516,9H1.484C0.665,9,0,8.335,0,7.516l0,0c0-0.82,0.665-1.484,1.484-1.484 h15.031C17.335,6.031,18,6.696,18,7.516L18,7.516z"/>
              <path fill="#424242" d="M18,13.516C18,14.335,17.335,15,16.516,15H1.484C0.665,15,0,14.335,0,13.516l0,0 c0-0.82,0.665-1.484,1.484-1.484h15.031C17.335,12.031,18,12.696,18,13.516L18,13.516z"/>
            </svg>
          </a>

          <div class="trigger" id="div-menu-items-wrapper">
            {% for page in site.pages %}
              {% if page.title %}
              <a class="page-link" href="{{ page.url | prepend: site.baseurl }}">{{ page.title }}</a>
              {% endif %}
            {% endfor %}
          </div>
        </nav>

      </div>
  </div>

</header>
<script type="text/javascript">
    function toggleMenu()
    {
        var el = document.getElementById("menu-icon");
        if (el.style.display != "none")
        {
            el = document.getElementById("div-menu-items-wrapper");
            el.style.display = (el.style.display != "block") ? "block" : "none";
        }
    }

    window.onload = function()
    {
        document.getElementById("menu-icon").addEventListener('click' , toggleMenu);
    }
</script>