Bootstrap headers

index.html

<!-- example 1 - using absolute position for center -->
<nav class="navbar navbar-expand-md navbar-dark bg-primary">
    <a class="navbar-brand abs" href="#">Navbar 1</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsingNavbar">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="navbar-collapse collapse" id="collapsingNavbar">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="//codeply.com">Codeply</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#myAlert" data-toggle="collapse">Link</a>
            </li>
        </ul>
        <ul class="navbar-nav ml-auto">
            <li class="nav-item">
                <a class="nav-link" href="" data-target="#myModal" data-toggle="modal">About</a>
            </li>
        </ul>
    </div>
</nav>

<!-- example 2 - using auto margins -->
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
    <div class="navbar-collapse collapse w-100 order-1 order-md-0 dual-collapse2">
        <ul class="navbar-nav mr-auto">
            <li class="nav-item active">
                <a class="nav-link" href="#">Left</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="//codeply.com">Codeply</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
    <div class="mx-auto order-0">
        <a class="navbar-brand mx-auto" href="#">Navbar 2</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".dual-collapse2">
            <span class="navbar-toggler-icon"></span>
        </button>
    </div>
    <div class="navbar-collapse collapse w-100 order-3 dual-collapse2">
        <ul class="navbar-nav ml-auto">
            <li class="nav-item">
                <a class="nav-link" href="#">Right</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
</nav>

<!-- 
example 3 - Navbar with brand left, links on center and right that collapse into the vert mobile menu
-->
<nav class="navbar navbar-light navbar-expand-md bg-faded justify-content-center">
    <a href="/" class="navbar-brand d-flex w-50 mr-auto">Navbar 3</a>
    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapsingNavbar3">
        <span class="navbar-toggler-icon"></span>
    </button>
    <div class="navbar-collapse collapse w-100" id="collapsingNavbar3">
        <ul class="navbar-nav w-100 justify-content-center">
            <li class="nav-item active">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="//codeply.com">Codeply</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
        <ul class="nav navbar-nav ml-auto w-100 justify-content-end">
            <li class="nav-item">
                <a class="nav-link" href="#">Right</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Right</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Right</a>
            </li>
        </ul>
    </div>
</nav>

<!-- 4 - contained in center example -->
<nav class="navbar navbar-expand-sm navbar-light bg-light">
    <div class="mx-auto d-sm-flex d-block flex-sm-nowrap">
        <a class="navbar-brand" href="#">Navbar 4</a>
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample11" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse text-center" id="navbarsExample11">
            <ul class="navbar-nav">
                <li class="nav-item active">
                    <a class="nav-link" href="#">Link</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">Link</a>
                </li>
            </ul>
        </div>
    </div>
</nav>

<!-- example 5 left and center only with empty space right -->
<nav class="navbar navbar-expand-sm navbar-dark bg-primary flex-nowrap">
    <button class="navbar-toggler mr-2" type="button" data-toggle="collapse" data-target="#navbar5">
        <span class="navbar-toggler-icon"></span>
    </button>
    <span class="navbar-brand w-100">Navbar 5</span>
    <div class="navbar-collapse collapse w-100 justify-content-center" id="navbar5">
        <ul class="navbar-nav mx-auto">
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Codeply</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Link</a>
            </li>
        </ul>
    </div>
    <div class="w-100"><!--spacer--></div>
</nav>


<!-- example 6 - center on mobile -->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
    <div class="d-flex flex-grow-1">
        <span class="w-100 d-lg-none d-block"><!-- hidden spacer to center brand on mobile --></span>
        <a class="navbar-brand d-none d-lg-inline-block" href="#">
            Navbar 6
        </a>
        <a class="navbar-brand-two mx-auto d-lg-none d-inline-block" href="#">
            <img src="//placehold.it/40?text=LOGO" alt="logo">
        </a>
        <div class="w-100 text-right">
            <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#myNavbar">
                <span class="navbar-toggler-icon"></span>
            </button>
        </div>
    </div>
    <div class="collapse navbar-collapse flex-grow-1 text-right" id="myNavbar">
        <ul class="navbar-nav ml-auto flex-nowrap">
            <li class="nav-item">
                <a href="#" class="nav-link m-2 menu-item nav-active">Our Solution</a>
            </li>
            <li class="nav-item">
                <a href="#" class="nav-link m-2 menu-item">How We Help</a>
            </li>
            <li class="nav-item">
                <a href="#" class="nav-link m-2 menu-item">Blog</a>
            </li>
            <li class="nav-item">
                <a href="#" class="nav-link m-2 menu-item">Contact</a>
            </li>
        </ul>
    </div>
</nav>



<div class="text-center">
    <span class="badge badge-dark badge-pill">
    this is viewport center
    </span>
</div>

style.css

@media (min-width: 768px) {
.navbar-brand.abs
    {
        position: absolute;
        width: 100%;
        left: 0;
        text-align: center;
    }
}