Header using Bootstrap 4.0

header.component.html

<!-- More examples are here https://www.codeply.com/go/qhaBrcWp3v -->
<nav class="navbar navbar-expand-lg navbar-light bg-light justify-content-center">

    <div class="d-flex mr-auto">
        <a class="navbar-brand logo-font p-0">TEST SYSTEM</a><span class="app-version text-secondary">1.0.0</span>
    </div>

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse w-100" id="navbarNavDropdown">
        <ul class="navbar-nav ml-auto mt-2 mt-lg-0">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="#" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Dropdown link
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
        <form class="form-inline my-2 my-lg-0">
            <input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
            <button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
        </form>
    </div>

    <a class="navbar-brand admin-logo justify-content-end ml-3" href="https://www.google.de" target="_blank">
        <img src="assets/images/system_logo.png" class="d-inline-block align-top header-logo" alt="system_logo">
    </a>
</nav>

header.component.scss

@import "../../../../styles/fonts";
@import '~bootstrap/scss/functions';
@import '~bootstrap/scss/variables';
@import '~bootstrap/scss/mixins';

.logo-font {
    font-family: $minalisFont;
    font-size: 28px;
    color: black;
    text-decoration: none;
}

.header-logo {
    height: 40px;
}

.app-version {
    vertical-align: sub;
    font-size: x-small;
}

.admin-logo {
    display: none;
}

@include media-breakpoint-up(xl) {
    .admin-logo {
        display: block;
    }
}