pelican-red/templates/_google_search.html

        <h3>Site Search</h3>
        <div class="google_search">
          <script>
            (function() {
              var cx = '{{ GOOGLE_SEARCH }}';
              var gcse = document.createElement('script');
              gcse.type = 'text/javascript';
              gcse.async = true;
              gcse.src = (document.location.protocol == 'https:' ? 'https:' : 'http:') +
                '//www.google.com/cse/cse.js?cx=' + cx;
              var s = document.getElementsByTagName('script')[0];
              s.parentNode.insertBefore(gcse, s);
            })();
          </script>
          <gcse:search></gcse:search>
        </div>