header.html

<!DOCTYPE html>
<html>
<head>
    <title>Header</title>
    <meta charset="UTF-8">

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

        <link rel="stylesheet" type="text/css" href="../css/navbar.css">

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script>

</head>
<body>
    <nav class="navbar navbar-default navbar-fixed-top" role="navigation">
        <div class="container-fluid">
              <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-WDM-navbar-collapse-1" aria-expanded="false">
                    <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="#">
                    <img alt="Brand" src="../img/fb_favicon.jpg">
                 </a>
            </div>

            <div class="collapse navbar-collapse" id="bs-WDM-navbar-collapse-1">
                <ul class="nav navbar-nav navbar-right">
                    <li><a href="./index.php">home</a></li>
                    <li><a href="./about.php">about</a></li>
                    <li><a href="./projects.php">projects</a></li>
                    <li><a href="./contact.php">contact</a></li>
                </ul>
            </div>
        </div>
    </nav>

</body>
</html>