header.html

<div class="container">
    <a class="navbar-brand" href="index.html">Aaron's Blog</a>
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation">
        Menu
        <i class="fas fa-bars"></i>
    </button>
    <div class="collapse navbar-collapse" id="navbarResponsive">
        <ul class="navbar-nav ml-auto">
            <li class="nav-item">
                <a class="nav-link" href="index.html">Home</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="about.html">About</a>
            </li>
            <!--
            <li class="nav-item">
                <a class="nav-link" href="post.html">Sample Post</a>
            </li>
            -->
            <li class="nav-item">
                <a class="nav-link" href="contact.html">Contact</a>
            </li>
        </ul>
    </div>
</div>