theshell.ch/site/_includes/header.html

<header>
    <span><a href="" class="title">THE SHELL</a></span>
    <span id="menuDesktop">
        <a href="">FILE SYSTEM</a>
        <a href="">BASIC</a>
        <a href="">INTERMEDIATE</a>
        <a href="">ADVANCED</a>
        <a href="">SCRIPTING</a>
    </span>

    <span id="menuTriggerMobile" onclick="triggerMenu(this)">
        <div class="strip1"></div>
        <div class="strip2"></div>
        <div class="strip3"></div>
    </span>
    <div id="menuMobile" style="margin-left:-100%;">
        <a class="menuItem selected" href="">FILE SYSTEM</a>
        <a class="menuItem" href="">BASIC</a>
        <a class="menuItem" href="">INTERMEDIATE</a>
        <a class="menuItem" href="">ADVANCED</a>
        <a class="menuItem" href="">SCRIPTING</a>
    </div>
</header>
<!-- <nav class="navbar">
    <div class="container">
        <ul class="navbar-list">
                <li class="navbar-item">
                  <a href="{{ "/" | prepend: site.baseurl | prepend: site.url }}">home</a>
                </li>
            {% for my_page in site.pages %}
            {% if my_page.title %}
                <li class="navbar-item">
                    <a href="{{ my_page.url | prepend: site.baseurl | prepend: site.url }}">
                      {{ my_page.title }}</a>
                </li>
            {% endif %}
            {% endfor %}
        </ul>
     </div>
</nav>-->