navbar.php

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">

<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
      </button>
      <a class="navbar-brand" href="https://nota-bene.org.pl/ranking">Ranking</a>
    </div>
    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li class=""><a href="https://nota-bene.org.pl/ranking">Home</a></li>
        <li><a href="https://nota-bene.org.pl/ranking/symulacja.php">Symulacja</a></li>
      </ul>
      <ul class="nav navbar-nav navbar-right">
        <li><a href="https://nota-bene.org.pl">Fundacja</a></li>
      </ul>
    </div>
  </div>
</nav>