header.php

<div class="collapse bg-dark" id="navbarHeader">
    <div class="container">
        <div class="row">
            <div class="col-sm-8 col-md-7 py-4">
                <h4 class="text-white">About</h4>
                <p class="text-muted">Vulnerable WebSocket Application.</p>
            </div>
            <div class="col-sm-4 offset-md-1 py-4">
                <h4 class="text-white">Contact</h4>
                <ul class="list-unstyled">
                    <li><a href="https://www.linkedin.com/in/serhatcck/" target="_blank" class="text-white">Linkedin</a></li>
                    <li><a href="https://github.com/Serhatcck" target="_blank" class="text-white">Github</a></li>

                </ul>
            </div>
        </div>
    </div>
</div>
<div class="navbar navbar-dark bg-dark box-shadow">
    <div class="container d-flex justify-content-between">
        <a href="#" class="navbar-brand d-flex align-items-center">

            <strong><?php if($_SESSION['is_admin']){ echo "Welcome Admin!";}else{ echo "WebSocket";}?></strong>
        </a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarHeader" aria-controls="navbarHeader" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
    </div>
    <a href="logout.php" class="navbar-brand d-flex align-items-center">LogOut</a>


</div>
<div class="collapse bg-dark" id="navbarHeader">
    <div class="container">
        <div class="row">
            <div class="col-sm-8 col-md-7 py-4">
                <h4 class="text-white">About</h4>
                <p class="text-muted">Vulnerable WebSocket Application.</p>
            </div>
            <div class="col-sm-4 offset-md-1 py-4">
                <h4 class="text-white">Contact</h4>
                <ul class="list-unstyled">
                    <li><a href="https://www.linkedin.com/in/serhatcck/" target="_blank" class="text-white">Linkedin</a></li>
                    <li><a href="https://github.com/Serhatcck" target="_blank" class="text-white">Github</a></li>
                </ul>
            </div>
        </div>
    </div>
</div>