unserver-unify/src/app/common/404.html

<div class="container content">
  <div class="row">
    <div class="col-md-8 col-md-offset-2">
      <div class="error-v1">
        <span class="error-v1-title">
          404
        </span>
        <span translate="">
          That is an error!
        </span>
        <p translate="">
          The requested URL was not found on this server. That's all we know
        </p>
        <a class="btn-u btn-bordered" translate="" ui-sref="index.home">
          Back Home
        </a>
      </div>
    </div>
  </div>
</div>