_includes/header.html

<div class="topbar">
    <div class="container">
      <div class="row" >
        <nav class="navbar navbar-default">
          <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
              <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button>
              <a class="navbar-brand" href="{{ "/" | prepend: site.baseurl }}"><img src="{{ "/images/logo.png" | prepend: site.baseurl }}" height="44px" style="margin-top:-7px"></a> </div>
            </div>
          </div>
          <!-- /.container-fluid -->
        </nav>
      </div>
    </div>
  </div>