laravel-blog/resources/views/admin/layouts/header.blade.php

<nav class="navbar navbar-dark sticky-top bg-dark flex-md-nowrap p-0">
    <a class="navbar-brand navbar navbar-dark col-sm-3 col-md-2 mr-0" href="#">Vien Blog Admin</a>
    {{--<input class="form-control form-control-dark w-100" type="text" placeholder="Search" aria-label="Search">--}}

    @auth('admin')
        <ul class="navbar-nav px-3">
            <li class="nav-item text-nowrap">
                <a class="nav-link" href="{{ route('admin.logout') }}"
                   onclick="event.preventDefault();document.getElementById('logout-form').submit();">
                    {{ __('Logout') }}
                </a>
                <form id="logout-form" action="{{ route('admin.logout') }}" method="POST" style="display: none;">
                    @csrf
                </form>
            </li>
        </ul>
    @endauth

</nav>