<form method="get" id="searchform" action="<?php echo esc_url(home_url('/') ); ?>/" class="navbar-form navbar-right nk-search">
        <button type="submit" class="btn btn-default">SEARCH</button>
        <div class="form-group">
          <input type="text" name="s" id="s" class="form-control">
        </div>


      </form>

    </div>

      <form method="get" id="searchform" action="<?php bloginfo('url'); ?>/" class="navbar-form navbar-right nk-search2">
        <button type="submit" class="btn btn-default">SEARCH</button>
        <div class="form-group">
          <input type="text" name="s" id="s" class="form-control formnk">
        </div>