<nav class="navbar navbar-expand-lg navbar-dark bg-dark fixed-top">
      <div class="container">
        <a class="navbar-brand" href="/">3dLook</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
          <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarResponsive">
          <ul class="navbar-nav ml-auto">
            <li class="nav-item{% if active_tab == 'main' %} active{% endif %}">
              <a class="nav-link" href="/">Main
              </a>
            </li>
            <li class="nav-item{% if active_tab == 'sizes' %} active{% endif %}">
              <a class="nav-link" href="{% url 'stats:size_statistics' %}">Sizes
              </a>
            </li>
            <li class="nav-item{% if active_tab == 'dataset_generation' %} active{% endif %}">
              <a class="nav-link" href="{% url 'stats:dataset_generation' %}">Dataset Generation
              </a>
            </li>
          {% if user.is_authenticated %}
              <li class="nav-item" ><a class="nav-link" href="{% url 'logout' %}" ><span>Logout</span></a></li>
          {% else %}
			<li class="nav-item" ><a class="nav-link" href="{% url 'login' %}" ><span>Login</span></a></li>
          {% endif %}
          </ul>
        </div>
      </div>
    </nav>