<th:block th:fragment="header">
    <header>
        <div class="container">
            <nav>
                <ul>
                    <li><strong>WhimsyWorld</strong></li>
                </ul>
                <ul>
                    <li><a href="https://gitea.awain.net/alterwain/WhimsyWorld"><img src="/file/svg/github.svg"/></a></li>
                    <li><a href="/logout"><button class="secondary">Logout</button></a></li>
                </ul>
            </nav>
        </div>
    </header>
</th:block>