header.php

<nav class="navbar navbar-inverse navbar-fixed-top">
        <div class="container-fluid">
            <!-- Logo -->
            <div class="row"> <div class=col-md-1> <a href="index.php"><embed height="50" width="50" src="21.png"></a></div>
            <div class="col-md-11">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#mainNavBar">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a href="index.php" class="navbar-brand">Phishing Email Detection Game</a>
            </div>
            <!-- Menu Items -->
            <div class="collapse navbar-collapse" id="mainNavBar">
                <ul class="nav navbar-nav">
                    <li class="active"> <a href="index.php">Home</a> </li>
                    <li> <a href="instruction.php">Instructions</a> </li> 
                    <li> <a href="contact.php">Contact Us</a> </li> 
                </ul>
            </div>
            </div></div></div>
    </nav><br><br><br><br>