themes/solr/templates/_search.html

<form id="quick-search" method="GET" action="https://sematext.com/opensee/solr" name="searchform">
  <fieldset>
    <div ng-show="toggled" class="search-box ng-hide">
      <input type="search" name="q" placeholder="Search..." accesskey="q"/>
      <a class="search-button" type="submit" onclick="this.closest('form').submit();return false;"><img src="{{ SITEURL }}/theme/images/magnifying-glass.png"/></a>
    </div>
  </fieldset>
</form>