<nav id="main-navigation" class="navigation">
    <button class="burger"><span class="burger-icon"><span></span></span> Menu</button>
    <ul class="navigation-items">
        <li>
            <a href="#">Home</a>
        </li>
        <li>
            <a href="#">Shop</a>
        </li>
        <li>
            <a href="#">Space Bears</a>
        </li>
        <li>
            <a href="#">Mars Cars</a>
        </li>
        <li>
            <a href="#">Contact</a>
        </li>
    </ul>
</nav>