Navbar fixed left - Bootstrap

I am trying to make navbar in bootstrap to be fixed left, like on this link. Anyway, it is working, but when I add block content of the leaflet map, my navbar is still there, but I can't click on it. Also, I don't get pointer mouse when I cross over the link. Here is code which I changed:

<!--NAVBAR-->
        <div class="navbar navbar-inverse navbar-fixed-left">
          <a class="navbar-brand" href="#">Brand</a>
          <ul class="nav navbar-nav">
           <li class="dropdown"><a href="#" class="dropdown-toggle" data-toggle="dropdown">Dropdown <span class="caret"></span></a>
             <ul class="dropdown-menu" role="menu">
              <li><a href="#">Sub Menu1</a></li>
              <li><a href="#">Sub Menu2</a></li>
              <li><a href="#">Sub Menu3</a></li>
              <li class="divider"></li>
              <li><a href="#">Sub Menu4</a></li>
              <li><a href="#">Sub Menu5</a></li>
             </ul>
           </li>
           <li><a href="#">Link2</a></li>
           <li><a href="#">Link3</a></li>
           <li><a href="#">Link4</a></li>
           <li><a href="#">Link5</a></li>
          </ul>
        </div>

        </div>
        <div class="container col-sm-12">
            <div class="row">
                {% block map_content %}
                        replace me
                {% endblock map_content %}
            </div>
        </div> 

Before this, I tried more elegant solution. I used bootstrap4 and tried something like this:

<nav  class="navbar navbar-inverse fixed-left">
          <div class="container-fluid">
            <div class="navbar-header">
                <a class="navbar-brand" href="{% url 'index' %}"><p class="logo_name">page name</p></a>
            </div>
            <ul class="nav navbar-nav">
               <li><a href="#">1</a></li>
               <li><a href="#">2</a></li>
               <li><a href="#">3</a></li>
               <li><a href="#">4</a></li>
            </ul>
          </div>
        </nav>

But it doesn't work, in this case, my navbar is fixed top, and not left.