<header>
  <nav class="navbar navbar-expand-lg navbar-dark bg-green">
    <a class="navbar-brand" href="#">Navbar</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
      <span class="navbar-toggler-icon"></span>
    </button>
    <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
      <div class="navbar-nav">
        <a class="nav-item nav-link" href="#">Home</a>
        <a class="nav-item nav-link" href="#">Features</a>
        <a class="nav-item nav-link" href="#">Pricing</a>
      </div>
      <div class="header-user mr-auto">
        <% if logged_in? %>
          <div class="user-avatar">
            <%= link_to image_tag( @current_user.avatar ), current_user %>
          </div>
          <div class="user-menu">
            <%= link_to @current_user.nickname, current_user %>
            <%= link_to "Log out", logout_path, method: "delete" %>
          </div>
        <% else %>
          <%= link_to image_tag("http://cdn.steamcommunity.com/public/images/signinthroughsteam/sits_large_noborder.png", class: "auth-btn"), '/auth/steam' %>
        <% end %>
      </div>
    </div>
  </nav>
</header>