   <input class="tree-toggle" type="checkbox" id="about"
               />
        <label class="tree-toggle-label "
               for="about">About</label>

        <ul class="subtree">
            <li >
                    <a href="https://spike.ist/about/intro/">About SPIKE</a>
                </li>

                <li >
                    <a href="https://spike.ist/about/project-status/">Project Maturity</a>
                </li>

                </ul>
    <input class="tree-toggle" type="checkbox" i