Popsu-coloque/web/core/themes/seven/templates/install-page.html.twig

{#
/**
 * @file
 * Seven theme implementation to display a Drupal installation page.
 *
 * All available variables are mirrored in page.html.twig.
 * Some may be blank but they are provided for consistency.
 *
 * @see template_preprocess_install_page()
 */
#}
<div class="layout-container">

  <header role="banner">
    {% if site_name %}
      <h1 class="page-title">
        {{ site_name }}
        {% if site_version %}
          <span class="site-version">{{ site_version }}</span>
        {% endif %}
      </h1>
    {% endif %}
  </header>

  {% if page.sidebar_first %}
    <aside class="layout-sidebar-first" role="complementary">
      {{ page.sidebar_first }}
    </aside>{# /.layout-sidebar-first #}
  {% endif %}

  <main role="main">
    {% if title %}
      <h2 class="heading-a">{{ title }}</h2>
    {% endif %}
    {{ page.highlighted }}
    {{ page.content }}
  </main>

  {% if page.sidebar_second %}
    <aside class="layout-sidebar-second" role="complementary">
      {{ page.sidebar_second }}
    </aside>{# /.layout-sidebar-second #}
  {% endif %}

  {% if page.page_bottom %}
    <footer role="contentinfo">
      {{ page.page_bottom }}
    </footer>
  {% endif %}

</div>{# /.layout-container #}