github.com/leonlxy/hyperledger@v1.0.0-alpha.0.20170427033203-34922035d248/docs/custom_theme/searchbox.html

<div role="search">
  <form id ="rtd-search-form-alt" class="wy-form" action="{{ base_url }}/search.html" method="get">
    <input type="text" name="q" placeholder="Search docs" />
  </form>
</div>