<div class="modal fade" id="about-popup" tabindex="-1" role="dialog" aria-labelledby="about-popup-label">
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      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="about-popup-label">RoofMapper</h4>
      </div>
      <div class="modal-body">
        <h4>Keyboard shortcuts</h4>
        <ul>
          <li>Space: display next building</li>
          <li>Backspace: display previous building</li>
          <li>Numpad 0-9: select roof material</li>
        </ul>
        <h4>Links</h4>
        <ul>
          <li>Client source code: <a href="https://github.com/tpetillon/roofmapper-client" target="_blank">GitHub repository</a></li>
        </ul>
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      <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
        <h4 class="modal-title" id="about-popup-label">RoofMapper</h4>
      </div>
      <div class="modal-body">
        <h4>Keyboard shortcuts</h4>
        <ul>
          <li>Space: display next building</li>
          <li>Backspace: display previous building</li>
          <li>Numpad 0-9: select roof material</li>
        </ul>
        <h4>Source code</h4>
        <ul>
          <li><a href="https://github.com/tpetillon/roofmapper-client" target="_blank">Client GitHub repository</a></li>
          <li><a href="https://github.com/tpetillon/roofmapper-server" target="_blank">Server GitHub repository</a></li>
        </ul>
        <h4>Licences</h4>
        <ul>
          <li>RoofMapper: © Thomas Pétillon, <a href="https://opensource.org/licenses/MIT">MIT</a></li>
          <li>OpenStreetMap data: © OpenStreetMap contributors, <a href="http://www.openstreetmap.org/copyright">ODbL</a></li>
        </ul>
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