weseek__growi/lib/views/layout-growi/widget/header.html

<div class="header-wrap">
  <header id="page-header">
    <div class="d-flex align-items-center">
      <div class="title-logo-container hidden-xs hidden-sm">
        <a class="logo" href="/">
          <div class="logo-mark">{% include '../../widget/logo.html' %}</div>
        </a>
      </div>
      <div class="title-container">
        <h1 class="title" id="revision-path"></h1>
        <div id="revision-url" class="url-line"></div>
      </div>
      {% if page %}
      {% include '../../widget/header-buttons.html' %}

      <ul class="authors hidden-sm hidden-xs text-nowrap">
        <li>
          <div class="d-flex align-items-center">
            <a class="m-r-5" href="{{ userPageRoot(page.creator) }}">
              <img src="{{ page.creator|default(author)|picture }}" class="picture img-circle">
            </a>
            <div>
              <div>Created by <a href="{{ userPageRoot(page.creator) }}">{{ page.creator.name|default(author.name) }}</a></div>
              <div class="text-muted">{{ page.createdAt|datetz('Y/m/d H:i:s') }}</div>
            </div>
          </div>
        </li>
        <li class="m-t-5">
          <div class="d-flex align-items-center">
            <a class="m-r-5" href="{{ userPageRoot(page.lastUpdateUser) }}">
              <img src="{{ page.lastUpdateUser|default(author)|picture }}" class="picture img-circle">
            </a>
            <div>
              <div>Updated by <a href="{{ userPageRoot(page.lastUpdateUser) }}">{{ page.lastUpdateUser.name|default(author.name) }}</a></div>
              <div class="text-muted">{{ page.updatedAt|datetz('Y/m/d H:i:s') }}</div>
            </div>
          </div>
        </li>
      </ul>
      {% endif %}

      {% if not page and ('/' === path or 'crowi' === behaviorType()) and not isUserPageList(path) and !isTrashPage() %}
        {% if '/' === path.slice(-1) %}
          {% include '../../widget/create_portal.html' %}
        {% endif %}
      {% endif %}

    </div>

  </header>
</div>