django-rest-framework/docs_theme/nav.html

<!-- New Navbar -->
<nav class="navbar navbar-expand-lg bg-body-tertiary">
  <div class="container-fluid">
    <a class="navbar-brand" href="https://www.django-rest-framework.org/"
      >Django REST framework</a
    >

    <button
      class="navbar-toggler"
      type="button"
      data-bs-toggle="collapse"
      data-bs-target="#navbarSupportedContent"
      aria-controls="navbarSupportedContent"
      aria-expanded="false"
      aria-label="Toggle navigation"
    >
      <span class="navbar-toggler-icon"></span>
    </button>

    <!-- Main navigation -->

    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      {% if nav|length>1 %}
      <ul class="navbar-nav me-auto mb-2 mb-lg-0">
        {% for nav_item in nav %} {% if nav_item.children %}
        <li class="nav-item dropdown">
          <a
            class="nav-link dropdown-toggle"
            href="#"
            role="button"
            data-bs-toggle="dropdown"
            aria-expanded="false"
          >
            {{ nav_item.title }}
          </a>
          <ul class="dropdown-menu">
            {% for nav_item in nav_item.children %}
            <li>
              <!-- prettier-ignore -->
              <a {% if nav_item.active %} class="dropdown-item active" {% else %} class="dropdown-item" {% endif %}
              
              href="#">{{ nav_item.title }}</a>
            </li>
            {% endfor %}
          </ul>
        </li>

        {% else %}
        <li class="nav-item">
          <!-- prettier-ignore -->
          <a {% if nav_item.active %} class="nav-link active" {% else %} class="nav-link" {% endif %}
          aria-current="page" href="{{ nav_item.url|url }}">{{ nav_item.title }}</a>
        </li>
        {% endif %} {% endfor %}
      </ul>
      {% endif %}

      <div class="d-flex gap-2">
        <button
          type="button"
          id="search_modal_show"
          class="btn btn-sm btn-secondary"
          href="#mkdocs_search_modal"
          data-bs-toggle="modal"
          data-bs-target="#mkdocs_search_modal"
        >
          Search
        </button>
        <!-- prettier-ignore -->
        <a 
        {% if page.previous_page %}href="{{ page.previous_page.url|url }}"{% endif %}
        {% if not page.previous_page %}disabled{% endif %}
        class="btn btn-sm btn-secondary"
      >Previous</a>

        <!-- prettier-ignore -->
        <a
        {% if page.next_page %}href="{{ page.next_page.url|url }}"{% endif %}
        {% if not page.next_page %}disabled{% endif %}
        class="btn btn-sm btn-secondary"
      >Next</a>

        <!-- prettier-ignore -->
        <a
        class="btn btn-primary btn-sm"
        href="https://github.com/encode/django-rest-framework/tree/master"
        >Github</a
      >
      </div>
    </div>
  </div>
</nav>